🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 187 (from laksa056)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa187.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.healthdirect.gov.au/caffeine\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.healthdirect.gov.au/caffeine\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.healthdirect.gov.au\/caffeine","crawl_time":1775026960,"first_indexed_time":1475626960,"http_code":200,"src_unparsed":"au,gov,healthdirect!www,\/caffeine s443","src_root_hash":"11476440364350543187","history_drop_reason":null,"meta_title":"Caffeine | healthdirect","meta_descriptions":["Caffeine is a stimulant found in coffee, tea, chocolate and energy drinks. It acts on your brain and nervous system. Learn how caffeine affects you."],"attrs_boilerpipe_text":"Key facts\nCaffeine is a stimulant that acts on your brain and nervous system.\nIt is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate.\nCaffeine is addictive and you may develop withdrawal symptoms when reducing your intake.\nOn this page\nWhat is caffeine?\nHow much caffeine is in food and drink?\nHow will caffeine affect my body?\nWhat are the side effects or risks of consuming caffeine?\nWhat are the health benefits of consuming caffeine?\nMixing caffeine with alcohol and other drugs\nHow can I reduce my caffeine intake?\nCaffeine withdrawal syndrome\nResources and support\nRelated information on Australian websites\nWhat is caffeine?\nCaffeine is a chemical that can stimulate your brain and\nnervous system\n.\nIt is found in foods and drinks like:\ncoffee\ntea leaves\ncocoa beans\nguarana — a South American plant with high levels of natural caffeine\nchocolate\ncola drinks\nenergy drinks\nCaffeine can also be found in small amounts in some prescription and\nover-the-counter medicines\n, such as some:\npain-relief medicines\ncough medicines\nweight loss products\nHow much caffeine is in food and drink?\nThe amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee.\nSource\nCaffeine\nEspresso (50 millilitre (mL) cup)\n145 milligrams (mg)\nEnergy drink (250mL can)\n80 mg\nInstant coffee (1 teaspoon)\n80 mg\nBlack tea (220mL cup)\n50 mg\nCola (375mL can)\n36 mg\nMilk chocolate (50 gram (g) bar)\n10 mg\nHow will caffeine affect my body?\nCaffeine affects everyone differently.\nThe effect of caffeine depends on:\nyour age, height and weight\nyour general health and if you have a medical condition\nthe amount you eat or drink\ngenetic factors\nwhether you regularly eat or drink caffeine\nwhether other food or drugs (including alcohol) are taken at the same time\nyour mood\nThe short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual.\nShort-term effects after a small amount of caffeine (100-200mg) can be:\nfeeling more alert and active\nhigher body temperature\nfaster breathing and heart rate\nIt's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients.\nWhat are the side effects or risks of consuming caffeine?\nThe amount of caffeine that is safe to have depends on your health and your age.\nHealthy adults can safely have around 400mg of caffeine a day. This is the same as:\n2 espressos\n4 instant coffees\n8 cups of black tea\nMany regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink.\nRegular heavy use of caffeine, more than 600mg a day, can cause:\nincreased production of stomach acid causing\nheartburn\nstomach ulcers\nosteoporosis\n(bone loss) in post-menopausal women\ninsomnia\n(difficulty sleeping)\nanxiety\nand\ndepression\nIf you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice.\nChildren and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods.\nOlder people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer.\nCaffeine also stays active for longer in the bodies of babies and\npregnant people\n.\nIf you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of:\nmiscarriage\nand\nstillbirth\nlow birth weight\ndelays in your baby's development during pregnancy\nIf you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as:\n1 espresso\n2 instant coffees\n4 cups of tea\nMuch of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine.\nWhat are the health benefits of consuming caffeine?\nThe effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others.\nBecause caffeine is a stimulant, it can make you feel more alert and energetic.\nThere is some evidence that caffeine might lower the chance of developing:\nAlzheimer's disease\ntype 2 diabetes\nParkinson's disease\ncancer\nliver disease\ndepression\nand suicide\nMost of these studies have looked at caffeine from coffee only.\nMixing caffeine with alcohol and other drugs\nDrinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm.\nCaffeine and medicines\nCaffeine can interact with\nover-the-counter\nand prescription medicines, such as:\nantibiotics\noral contraceptives\nsome antidepressants\nsome heart medicines\nAsk your pharmacist or doctor if any medicines that you take could be affected by caffeine.\nCaffeine, alcohol and illicit drugs\nWhen you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours.\nCaffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night.\nCaffeine can also interact with other stimulants such as\ncocaine\nand\nmethamphetamine\n. It can increase your chance of problems such as an abnormal health rate or\nheart rhythm\n.\nHow can I reduce my caffeine intake?\nIf you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day.\nIf you drink coffee, you can reduce your intake by switching to decaffeinated coffee.\nIf you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas.\nIf you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead.\nIf you want to reduce your caffeine intake, check\nfood and drink ingredient lists\nfor caffeine.\nCaffeine withdrawal syndrome\nIf you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include:\nheadaches\ntiredness\nirritability\nnausea\ndepression\nand\nanxiety\nsweating\ndifficulty concentrating\nIf you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week.\nResources and support\nYou can find out more about caffeine through the\nAlcohol and Drug Foundation\n— call their Drug Info and Advice Line on\n1300 85 85 84\n.\nYou can also call the healthdirect helpline on\n1800 022 222\n(known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week.","attrs_markdown":"[![healthdirect australia logo](https:\/\/www.healthdirect.gov.au\/assets\/images\/logo-hda.svg)](https:\/\/www.healthdirect.gov.au\/)\n\nSign in\n\n- [Join](https:\/\/www.healthdirect.gov.au\/account\/join)\n- [Sign in](https:\/\/www.healthdirect.gov.au\/account\/signin)\n\nMenu\n# Healthdirect Free Australian health advice you can count on.\nJoin\n\nSign in\n\nMedical problem? Call 1800 022 222. If you need urgent medical help, call triple zero immediately\n\nhealthdirect Australia is a free service where you can talk to a nurse or doctor who can help you know what to do.\n\n- [Home](https:\/\/www.healthdirect.gov.au\/)\n- Health topics A-Z\n  - [Conditions](https:\/\/www.healthdirect.gov.au\/health-topics\/conditions) [Gastroenteritis](https:\/\/www.healthdirect.gov.au\/gastroenteritis) [Skin Conditions](https:\/\/www.healthdirect.gov.au\/skin-conditions) [Whooping Cough](https:\/\/www.healthdirect.gov.au\/whooping-cough)\n  - [Symptoms](https:\/\/www.healthdirect.gov.au\/health-topics\/symptoms) [Abdominal Pain](https:\/\/www.healthdirect.gov.au\/abdominal-pain) [Bites and Stings](https:\/\/www.healthdirect.gov.au\/bites-and-stings) [Diarrhoea](https:\/\/www.healthdirect.gov.au\/diarrhoea)\n  - [Procedures](https:\/\/www.healthdirect.gov.au\/health-topics\/procedures) [Colonoscopy](https:\/\/www.healthdirect.gov.au\/colonoscopy) [Grommets](https:\/\/www.healthdirect.gov.au\/grommets) [Liposuction](https:\/\/www.healthdirect.gov.au\/liposuction) [Tubal ligation](https:\/\/www.healthdirect.gov.au\/tubal-ligation)\n  - 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[Conditions](https:\/\/www.healthdirect.gov.au\/health-topics\/conditions)\n  - [Symptoms](https:\/\/www.healthdirect.gov.au\/health-topics\/symptoms)\n  - [Procedures](https:\/\/www.healthdirect.gov.au\/health-topics\/procedures)\n  - [Life stages](https:\/\/www.healthdirect.gov.au\/life-stages)\n  - [All topics](https:\/\/www.healthdirect.gov.au\/health-topics)\n- [Medicines](https:\/\/www.healthdirect.gov.au\/medicines)\n- [Symptom checker](https:\/\/www.healthdirect.gov.au\/symptom-checker)\n- [Service finder](https:\/\/www.healthdirect.gov.au\/australian-health-services)\n\n[beginning of content]()\n\n# Caffeine\n*6-minute read*\n\nPrint\n\nShare\n\n[share via Facebook](https:\/\/www.facebook.com\/sharer\/sharer.php?u=https:\/\/www.healthdirect.gov.au\/caffeine \"Share this page on Facebook\")\n\nshare via Email\n\nSave\n\n[Listen](https:\/\/app-oc.readspeaker.com\/cgi-bin\/rsent?customerid=8207&lang=en_au&readid=mainContentArticleText&url=https:\/\/www.healthdirect.gov.au\/caffeine \"Listen to this page using ReadSpeaker\")\n\n## Key facts\n- Caffeine is a stimulant that acts on your brain and nervous system.\n- It is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate.\n- Caffeine is addictive and you may develop withdrawal symptoms when reducing your intake.\n\n## On this page\n- [What is caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#what-is)\n- [How much caffeine is in food and drink?](https:\/\/www.healthdirect.gov.au\/caffeine#how-much)\n- [How will caffeine affect my body?](https:\/\/www.healthdirect.gov.au\/caffeine#affect)\n- [What are the side effects or risks of consuming caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#side-effects)\n- [What are the health benefits of consuming caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#health-benefits)\n- [Mixing caffeine with alcohol and other drugs](https:\/\/www.healthdirect.gov.au\/caffeine#mixing)\n- [How can I reduce my caffeine intake?](https:\/\/www.healthdirect.gov.au\/caffeine#reduce)\n- [Caffeine withdrawal syndrome](https:\/\/www.healthdirect.gov.au\/caffeine#withdrawal)\n- [Resources and support](https:\/\/www.healthdirect.gov.au\/caffeine#resources)\n- [Related information on Australian websites](https:\/\/www.healthdirect.gov.au\/caffeine#searchGeneralResults)\n## What is caffeine?\nCaffeine is a chemical that can stimulate your brain and [nervous system](https:\/\/www.healthdirect.gov.au\/nervous-system).\n\nIt is found in foods and drinks like:\n\n- coffee\n- tea leaves\n- cocoa beans\n- guarana — a South American plant with high levels of natural caffeine\n- chocolate\n- cola drinks\n- energy drinks\n\nCaffeine can also be found in small amounts in some prescription and [over-the-counter medicines](https:\/\/www.healthdirect.gov.au\/over-the-counter-medicines), such as some:\n\n- [pain-relief medicines](https:\/\/www.healthdirect.gov.au\/pain-relief-medicines)\n- cough medicines\n- weight loss products\n## How much caffeine is in food and drink?\nThe amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee.\n\n| **Source** | **Caffeine** |\n|---|---|\n| Espresso (50 millilitre (mL) cup) | 145 milligrams (mg) |\n| Energy drink (250mL can) | 80 mg |\n| Instant coffee (1 teaspoon) | 80 mg |\n| Black tea (220mL cup) | 50 mg |\n| Cola (375mL can) | 36 mg |\n| Milk chocolate (50 gram (g) bar) | 10 mg |\n## How will caffeine affect my body?\nCaffeine affects everyone differently.\n\nThe effect of caffeine depends on:\n\n- your age, height and weight\n- your general health and if you have a medical condition\n- the amount you eat or drink\n- genetic factors\n- whether you regularly eat or drink caffeine\n- whether other food or drugs (including alcohol) are taken at the same time\n- your mood\n\nThe short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual.\n\nShort-term effects after a small amount of caffeine (100-200mg) can be:\n\n- feeling more alert and active\n- higher body temperature\n- faster breathing and heart rate\n\nIt's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients.\n\n## What are the side effects or risks of consuming caffeine?\nThe amount of caffeine that is safe to have depends on your health and your age.\n\nHealthy adults can safely have around 400mg of caffeine a day. This is the same as:\n\n- 2 espressos\n- 4 instant coffees\n- 8 cups of black tea\n\nMany regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink.\n\nRegular heavy use of caffeine, more than 600mg a day, can cause:\n\n- increased production of stomach acid causing [heartburn](https:\/\/www.healthdirect.gov.au\/heartburn)\n- [stomach ulcers](https:\/\/www.healthdirect.gov.au\/stomach-ulcers)\n- [osteoporosis](https:\/\/www.healthdirect.gov.au\/osteoporosis) (bone loss) in post-menopausal women\n- [insomnia](https:\/\/www.healthdirect.gov.au\/insomnia) (difficulty sleeping)\n- [anxiety](https:\/\/www.healthdirect.gov.au\/anxiety) and [depression](https:\/\/www.healthdirect.gov.au\/depression)\n\nIf you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice.\n\nChildren and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods.\n\nOlder people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer.\n\nCaffeine also stays active for longer in the bodies of babies and [pregnant people](https:\/\/www.pregnancybirthbaby.org.au\/caffeine-during-pregnancy).\n\nIf you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of:\n\n- [miscarriage](https:\/\/www.pregnancybirthbaby.org.au\/miscarriage) and [stillbirth](https:\/\/www.pregnancybirthbaby.org.au\/what-is-a-stillbirth)\n- low birth weight\n- delays in your baby's development during pregnancy\n\nIf you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as:\n\n- 1 espresso\n- 2 instant coffees\n- 4 cups of tea\n\nMuch of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine.\n\n## What are the health benefits of consuming caffeine?\nThe effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others.\n\nBecause caffeine is a stimulant, it can make you feel more alert and energetic.\n\nThere is some evidence that caffeine might lower the chance of developing:\n\n- [Alzheimer's disease](https:\/\/www.healthdirect.gov.au\/alzheimers-disease)\n- [type 2 diabetes](https:\/\/www.healthdirect.gov.au\/type-2-diabetes)\n- [Parkinson's disease](https:\/\/www.healthdirect.gov.au\/parkinsons-disease)\n- [cancer](https:\/\/www.healthdirect.gov.au\/cancer-types)\n- [liver disease](https:\/\/www.healthdirect.gov.au\/liver-conditions-and-diseases)\n- [depression](https:\/\/www.healthdirect.gov.au\/depression) and suicide\n\nMost of these studies have looked at caffeine from coffee only.\n\n## Mixing caffeine with alcohol and other drugs\nDrinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm.\n\n### Caffeine and medicines\nCaffeine can interact with [over-the-counter](https:\/\/www.healthdirect.gov.au\/over-the-counter-medicines) and prescription medicines, such as:\n\n- [antibiotics](https:\/\/www.healthdirect.gov.au\/antibiotics)\n- [oral contraceptives](https:\/\/www.healthdirect.gov.au\/the-pill-combined-oral-contraceptive-pill)\n- some antidepressants\n- some heart medicines\n\nAsk your pharmacist or doctor if any medicines that you take could be affected by caffeine.\n\n### Caffeine, alcohol and illicit drugs\nWhen you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours.\n\nCaffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night.\n\nCaffeine can also interact with other stimulants such as [cocaine](https:\/\/www.healthdirect.gov.au\/cocaine) and [methamphetamine](https:\/\/www.healthdirect.gov.au\/ice-crystal-meth). It can increase your chance of problems such as an abnormal health rate or [heart rhythm](https:\/\/www.healthdirect.gov.au\/heart-arrhythmias).\n\n## How can I reduce my caffeine intake?\nIf you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day.\n\nIf you drink coffee, you can reduce your intake by switching to decaffeinated coffee.\n\nIf you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas.\n\nIf you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead.\n\nIf you want to reduce your caffeine intake, check [food and drink ingredient lists](https:\/\/www.healthdirect.gov.au\/how-to-read-food-labels) for caffeine.\n\n## Caffeine withdrawal syndrome\nIf you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include:\n\n- [headaches](https:\/\/www.healthdirect.gov.au\/headaches)\n- [tiredness](https:\/\/www.healthdirect.gov.au\/fatigue)\n- [irritability](https:\/\/www.healthdirect.gov.au\/irritability-and-feeling-on-edge)\n- [nausea](https:\/\/www.healthdirect.gov.au\/nausea)\n- [depression](https:\/\/www.healthdirect.gov.au\/depression) and [anxiety](https:\/\/www.healthdirect.gov.au\/anxiety)\n- sweating\n- difficulty concentrating\n\nIf you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week.\n\n## Resources and support\nYou can find out more about caffeine through the [Alcohol and Drug Foundation](https:\/\/adf.org.au\/) — call their Drug Info and Advice Line on [1300 85 85 84](tel:1300858584).\n\nYou can also call the healthdirect helpline on [1800 022 222](tel:1800022222) (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week.\n\n#### Sources:\nAlcohol and Drug Foundation *[(Caffeine)](https:\/\/adf.org.au\/drug-facts\/caffeine\/ \"Caffeine\")*, European Journal of Medicinal Chemistry Reports *[(Pharmacology of caffeine and its effects on the human body)](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2772417424000104?ref=pdf_download&fr=RR-2&rr=96b5e46f7f92e7e4 \"Pharmacology of caffeine and its effects on the human body\")*, JAMA Network *[(Caffeine and Health)](https:\/\/jamanetwork.com\/journals\/jama\/fullarticle\/2789026 \"Caffeine and Health\")*, Food Standards Australia & New Zealand *[(Caffeine)](https:\/\/www.foodstandards.gov.au\/consumer\/prevention-of-foodborne-illness\/caffeine \"Caffeine\")*, State Library NSW *[(Caffeine)](https:\/\/www.sl.nsw.gov.au\/drug-info\/drugs\/z-drugs\/caffeine \"Caffeine\")*, Australian Breastfeeding Association *[(Caffeine and breastfeeding)](https:\/\/www.breastfeeding.asn.au\/resources\/caffeine-and-breastfeeding \"Caffeine and breastfeeding\")*\n\nLearn more here about the [development and quality assurance of healthdirect content](https:\/\/www.healthdirect.gov.au\/about-our-content).\n\nLast reviewed: August 2025\n\n[Back To Top](https:\/\/www.healthdirect.gov.au\/caffeine#backToTop)\n\n## Search our site for\n- [Coffee](https:\/\/www.healthdirect.gov.au\/search-results\/Coffee \"Search results for: Coffee\")\n- [Chocolate](https:\/\/www.healthdirect.gov.au\/search-results\/Chocolate \"Search results for: Chocolate\")\n- [Soft Drinks](https:\/\/www.healthdirect.gov.au\/search-results\/Soft%20Drinks \"Search results for: Soft Drinks\")\n- [Tea](https:\/\/www.healthdirect.gov.au\/search-results\/Tea \"Search results for: Tea\")\n\n## Need more information?\nThese trusted information partners have more on this topic.\n\nGeneral search results\n\nResults for medical professionals\n\nTop results\n\n[Caffeine \\| Your Fertility Are you trying to conceive and wondering if caffeine is affecting your Fertility? Visit the health and medical section of our website for more information. *Read more on Your Fertility website* ![Your Fertility](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/YourFertility_logo.png)](https:\/\/www.yourfertility.org.au\/everyone\/drugs-chemicals\/caffeine)\n\n[Caffeine - Alcohol and Drug Foundation Discover how caffeine affects your body and mind as the world's most consumed stimulant. Learn about sources, recommended limits, withdrawal symptoms, and health impacts. *Read more on Alcohol and Drug Foundation website* ![Alcohol and Drug Foundation](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/Australian-Drug-Foundation_logo.png)](https:\/\/adf.org.au\/drug-facts\/caffeine\/)\n\n[Caffeine and Energy Drinks Effects and Withdrawal Symptoms \\| Your Room Caffeine and energy drinks, when consumed in large quantities, can cause unwanted side effects. Find out about withdrawal symptoms and other FAQs. *Read more on NSW Health website* ![NSW Health](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/NSW-Health.png)](https:\/\/yourroom.health.nsw.gov.au\/a-z-of-drugs\/Pages\/energy-drinks-and-caffeine.aspx)\n\n[Caffeine and Sleep \\| Sleep Health Foundation This is a fact sheet about Caffeine and Sleep. Caffeine can have a significant impact on falling asleep and staying asleep. *Read more on Sleep Health Foundation website* ![Sleep Health Foundation](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/sleephealthfoundation_logo-teal-a37684.png)](https:\/\/www.sleephealthfoundation.org.au\/sleep-topics\/caffeine-and-sleep)\n\n[Caffeine \\| Better Health Channel Caffeine is a stimulant that acts on the brain and nervous system. *Read more on Better Health Channel website* ![Better Health Channel](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/bhc-rectangle-image-e99950.png)](https:\/\/www.betterhealth.vic.gov.au\/health\/healthyliving\/caffeine)\n\n[Caffeine during pregnancy and breastfeeding Some foods, drinks and medicines contain caffeine. Read about safe use during pregnancy and breastfeeding, risks, and alternatives. *Read more on Pregnancy,Birth & Baby website* ![Pregnancy,Birth & Baby](https:\/\/media.healthdirect.org.au\/images\/logos\/h40\/PBB_logo.png)](https:\/\/www.pregnancybirthbaby.org.au\/caffeine-during-pregnancy)\n\nShow more\n\nTop results\n\nShow more\n\n## Disclaimer\nHealthdirect Australia is not responsible for the content and advertising on the external website you are now entering.\n\n[OK]()\n\n## Search our site for\n- [Coffee](https:\/\/www.healthdirect.gov.au\/search-results\/Coffee \"Search results for: Coffee\")\n- [Chocolate](https:\/\/www.healthdirect.gov.au\/search-results\/Chocolate \"Search results for: Chocolate\")\n- [Soft Drinks](https:\/\/www.healthdirect.gov.au\/search-results\/Soft%20Drinks \"Search results for: Soft Drinks\")\n- [Tea](https:\/\/www.healthdirect.gov.au\/search-results\/Tea \"Search results for: Tea\")\n\n## Symptom checker\n**Worried about your health?**\n\nSelect a 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We pay our respects to the Traditional Owners and to Elders both past and present.\n\n© 2026 Healthdirect Australia Limited\n\n## Support for this browser is being discontinued\nSupport for this browser is being discontinued for this site\n\n- Internet Explorer 11 and lower\n\nWe currently support Microsoft Edge, Chrome, Firefox and Safari. For more information, please visit the links below:\n\n- [Chrome by Google](https:\/\/www.google.com.au\/chrome\/)\n- [Firefox by Mozilla](https:\/\/www.mozilla.org\/en-US\/firefox\/new)\n- [Microsoft Edge](https:\/\/www.microsoft.com\/en-us\/edge)\n- [Safari by Apple](https:\/\/support.apple.com\/en_AU\/downloads\/safari)\n\nYou are welcome to continue browsing this site with this browser. Some features, tools or interaction may not work correctly.\n\nContinue\n\n![](https:\/\/www.facebook.com\/tr?id=286390378916509&ev=PageView%0A%0A&noscript=1)","attrs_readable_markdown":"## Key facts\n- Caffeine is a stimulant that acts on your brain and nervous system.\n- It is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate.\n- Caffeine is addictive and you may develop withdrawal symptoms when reducing your intake.\n\n## On this page\n- [What is caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#what-is)\n- [How much caffeine is in food and drink?](https:\/\/www.healthdirect.gov.au\/caffeine#how-much)\n- [How will caffeine affect my body?](https:\/\/www.healthdirect.gov.au\/caffeine#affect)\n- [What are the side effects or risks of consuming caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#side-effects)\n- [What are the health benefits of consuming caffeine?](https:\/\/www.healthdirect.gov.au\/caffeine#health-benefits)\n- [Mixing caffeine with alcohol and other drugs](https:\/\/www.healthdirect.gov.au\/caffeine#mixing)\n- [How can I reduce my caffeine intake?](https:\/\/www.healthdirect.gov.au\/caffeine#reduce)\n- [Caffeine withdrawal syndrome](https:\/\/www.healthdirect.gov.au\/caffeine#withdrawal)\n- [Resources and support](https:\/\/www.healthdirect.gov.au\/caffeine#resources)\n- [Related information on Australian websites](https:\/\/www.healthdirect.gov.au\/caffeine#searchGeneralResults)\n## What is caffeine?\nCaffeine is a chemical that can stimulate your brain and [nervous system](https:\/\/www.healthdirect.gov.au\/nervous-system).\n\nIt is found in foods and drinks like:\n\n- coffee\n- tea leaves\n- cocoa beans\n- guarana — a South American plant with high levels of natural caffeine\n- chocolate\n- cola drinks\n- energy drinks\n\nCaffeine can also be found in small amounts in some prescription and [over-the-counter medicines](https:\/\/www.healthdirect.gov.au\/over-the-counter-medicines), such as some:\n\n- [pain-relief medicines](https:\/\/www.healthdirect.gov.au\/pain-relief-medicines)\n- cough medicines\n- weight loss products\n## How much caffeine is in food and drink?\nThe amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee.\n\n| **Source** | **Caffeine** |\n|---|---|\n| Espresso (50 millilitre (mL) cup) | 145 milligrams (mg) |\n| Energy drink (250mL can) | 80 mg |\n| Instant coffee (1 teaspoon) | 80 mg |\n| Black tea (220mL cup) | 50 mg |\n| Cola (375mL can) | 36 mg |\n| Milk chocolate (50 gram (g) bar) | 10 mg |\n## How will caffeine affect my body?\nCaffeine affects everyone differently.\n\nThe effect of caffeine depends on:\n\n- your age, height and weight\n- your general health and if you have a medical condition\n- the amount you eat or drink\n- genetic factors\n- whether you regularly eat or drink caffeine\n- whether other food or drugs (including alcohol) are taken at the same time\n- your mood\n\nThe short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual.\n\nShort-term effects after a small amount of caffeine (100-200mg) can be:\n\n- feeling more alert and active\n- higher body temperature\n- faster breathing and heart rate\n\nIt's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients.\n\n## What are the side effects or risks of consuming caffeine?\nThe amount of caffeine that is safe to have depends on your health and your age.\n\nHealthy adults can safely have around 400mg of caffeine a day. This is the same as:\n\n- 2 espressos\n- 4 instant coffees\n- 8 cups of black tea\n\nMany regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink.\n\nRegular heavy use of caffeine, more than 600mg a day, can cause:\n\n- increased production of stomach acid causing [heartburn](https:\/\/www.healthdirect.gov.au\/heartburn)\n- [stomach ulcers](https:\/\/www.healthdirect.gov.au\/stomach-ulcers)\n- [osteoporosis](https:\/\/www.healthdirect.gov.au\/osteoporosis) (bone loss) in post-menopausal women\n- [insomnia](https:\/\/www.healthdirect.gov.au\/insomnia) (difficulty sleeping)\n- [anxiety](https:\/\/www.healthdirect.gov.au\/anxiety) and [depression](https:\/\/www.healthdirect.gov.au\/depression)\n\nIf you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice.\n\nChildren and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods.\n\nOlder people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer.\n\nCaffeine also stays active for longer in the bodies of babies and [pregnant people](https:\/\/www.pregnancybirthbaby.org.au\/caffeine-during-pregnancy).\n\nIf you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of:\n\n- [miscarriage](https:\/\/www.pregnancybirthbaby.org.au\/miscarriage) and [stillbirth](https:\/\/www.pregnancybirthbaby.org.au\/what-is-a-stillbirth)\n- low birth weight\n- delays in your baby's development during pregnancy\n\nIf you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as:\n\n- 1 espresso\n- 2 instant coffees\n- 4 cups of tea\n\nMuch of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine.\n\n## What are the health benefits of consuming caffeine?\nThe effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others.\n\nBecause caffeine is a stimulant, it can make you feel more alert and energetic.\n\nThere is some evidence that caffeine might lower the chance of developing:\n\n- [Alzheimer's disease](https:\/\/www.healthdirect.gov.au\/alzheimers-disease)\n- [type 2 diabetes](https:\/\/www.healthdirect.gov.au\/type-2-diabetes)\n- [Parkinson's disease](https:\/\/www.healthdirect.gov.au\/parkinsons-disease)\n- [cancer](https:\/\/www.healthdirect.gov.au\/cancer-types)\n- [liver disease](https:\/\/www.healthdirect.gov.au\/liver-conditions-and-diseases)\n- [depression](https:\/\/www.healthdirect.gov.au\/depression) and suicide\n\nMost of these studies have looked at caffeine from coffee only.\n\n## Mixing caffeine with alcohol and other drugs\nDrinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm.\n\n### Caffeine and medicines\nCaffeine can interact with [over-the-counter](https:\/\/www.healthdirect.gov.au\/over-the-counter-medicines) and prescription medicines, such as:\n\n- [antibiotics](https:\/\/www.healthdirect.gov.au\/antibiotics)\n- [oral contraceptives](https:\/\/www.healthdirect.gov.au\/the-pill-combined-oral-contraceptive-pill)\n- some antidepressants\n- some heart medicines\n\nAsk your pharmacist or doctor if any medicines that you take could be affected by caffeine.\n\n### Caffeine, alcohol and illicit drugs\nWhen you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours.\n\nCaffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night.\n\nCaffeine can also interact with other stimulants such as [cocaine](https:\/\/www.healthdirect.gov.au\/cocaine) and [methamphetamine](https:\/\/www.healthdirect.gov.au\/ice-crystal-meth). It can increase your chance of problems such as an abnormal health rate or [heart rhythm](https:\/\/www.healthdirect.gov.au\/heart-arrhythmias).\n\n## How can I reduce my caffeine intake?\nIf you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day.\n\nIf you drink coffee, you can reduce your intake by switching to decaffeinated coffee.\n\nIf you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas.\n\nIf you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead.\n\nIf you want to reduce your caffeine intake, check [food and drink ingredient lists](https:\/\/www.healthdirect.gov.au\/how-to-read-food-labels) for caffeine.\n\n## Caffeine withdrawal syndrome\nIf you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include:\n\n- [headaches](https:\/\/www.healthdirect.gov.au\/headaches)\n- [tiredness](https:\/\/www.healthdirect.gov.au\/fatigue)\n- [irritability](https:\/\/www.healthdirect.gov.au\/irritability-and-feeling-on-edge)\n- [nausea](https:\/\/www.healthdirect.gov.au\/nausea)\n- [depression](https:\/\/www.healthdirect.gov.au\/depression) and [anxiety](https:\/\/www.healthdirect.gov.au\/anxiety)\n- sweating\n- difficulty concentrating\n\nIf you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week.\n\n## Resources and support\nYou can find out more about caffeine through the [Alcohol and Drug Foundation](https:\/\/adf.org.au\/) — call their Drug Info and Advice Line on [1300 85 85 84](tel:1300858584).\n\nYou can also call the healthdirect helpline on [1800 022 222](tel:1800022222) (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week.","meta_canonical":null}

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Boilerpipe Text	Key facts Caffeine is a stimulant that acts on your brain and nervous system. It is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate. Caffeine is addictive and you may develop withdrawal symptoms when reducing your intake. On this page What is caffeine? How much caffeine is in food and drink? How will caffeine affect my body? What are the side effects or risks of consuming caffeine? What are the health benefits of consuming caffeine? Mixing caffeine with alcohol and other drugs How can I reduce my caffeine intake? Caffeine withdrawal syndrome Resources and support Related information on Australian websites What is caffeine? Caffeine is a chemical that can stimulate your brain and nervous system . It is found in foods and drinks like: coffee tea leaves cocoa beans guarana — a South American plant with high levels of natural caffeine chocolate cola drinks energy drinks Caffeine can also be found in small amounts in some prescription and over-the-counter medicines , such as some: pain-relief medicines cough medicines weight loss products How much caffeine is in food and drink? The amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee. Source Caffeine Espresso (50 millilitre (mL) cup) 145 milligrams (mg) Energy drink (250mL can) 80 mg Instant coffee (1 teaspoon) 80 mg Black tea (220mL cup) 50 mg Cola (375mL can) 36 mg Milk chocolate (50 gram (g) bar) 10 mg How will caffeine affect my body? Caffeine affects everyone differently. The effect of caffeine depends on: your age, height and weight your general health and if you have a medical condition the amount you eat or drink genetic factors whether you regularly eat or drink caffeine whether other food or drugs (including alcohol) are taken at the same time your mood The short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual. Short-term effects after a small amount of caffeine (100-200mg) can be: feeling more alert and active higher body temperature faster breathing and heart rate It's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients. What are the side effects or risks of consuming caffeine? The amount of caffeine that is safe to have depends on your health and your age. Healthy adults can safely have around 400mg of caffeine a day. This is the same as: 2 espressos 4 instant coffees 8 cups of black tea Many regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink. Regular heavy use of caffeine, more than 600mg a day, can cause: increased production of stomach acid causing heartburn stomach ulcers osteoporosis (bone loss) in post-menopausal women insomnia (difficulty sleeping) anxiety and depression If you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice. Children and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods. Older people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer. Caffeine also stays active for longer in the bodies of babies and pregnant people . If you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of: miscarriage and stillbirth low birth weight delays in your baby's development during pregnancy If you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as: 1 espresso 2 instant coffees 4 cups of tea Much of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine. What are the health benefits of consuming caffeine? The effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others. Because caffeine is a stimulant, it can make you feel more alert and energetic. There is some evidence that caffeine might lower the chance of developing: Alzheimer's disease type 2 diabetes Parkinson's disease cancer liver disease depression and suicide Most of these studies have looked at caffeine from coffee only. Mixing caffeine with alcohol and other drugs Drinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm. Caffeine and medicines Caffeine can interact with over-the-counter and prescription medicines, such as: antibiotics oral contraceptives some antidepressants some heart medicines Ask your pharmacist or doctor if any medicines that you take could be affected by caffeine. Caffeine, alcohol and illicit drugs When you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours. Caffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night. Caffeine can also interact with other stimulants such as cocaine and methamphetamine . It can increase your chance of problems such as an abnormal health rate or heart rhythm . How can I reduce my caffeine intake? If you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day. If you drink coffee, you can reduce your intake by switching to decaffeinated coffee. If you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas. If you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead. If you want to reduce your caffeine intake, check food and drink ingredient lists for caffeine. Caffeine withdrawal syndrome If you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include: headaches tiredness irritability nausea depression and anxiety sweating difficulty concentrating If you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week. Resources and support You can find out more about caffeine through the Alcohol and Drug Foundation — call their Drug Info and Advice Line on 1300 85 85 84 . You can also call the healthdirect helpline on 1800 022 222 (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week.
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Caffeine is a stimulant that acts on your brain and nervous system. - It is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate. - Caffeine is addictive and you may develop withdrawal symptoms when reducing your intake. ## On this page - [What is caffeine?](https://www.healthdirect.gov.au/caffeine#what-is) - [How much caffeine is in food and drink?](https://www.healthdirect.gov.au/caffeine#how-much) - [How will caffeine affect my body?](https://www.healthdirect.gov.au/caffeine#affect) - [What are the side effects or risks of consuming caffeine?](https://www.healthdirect.gov.au/caffeine#side-effects) - [What are the health benefits of consuming caffeine?](https://www.healthdirect.gov.au/caffeine#health-benefits) - [Mixing caffeine with alcohol and other drugs](https://www.healthdirect.gov.au/caffeine#mixing) - [How can I reduce my caffeine intake?](https://www.healthdirect.gov.au/caffeine#reduce) - [Caffeine withdrawal syndrome](https://www.healthdirect.gov.au/caffeine#withdrawal) - [Resources and support](https://www.healthdirect.gov.au/caffeine#resources) - [Related information on Australian websites](https://www.healthdirect.gov.au/caffeine#searchGeneralResults) ## What is caffeine? Caffeine is a chemical that can stimulate your brain and [nervous system](https://www.healthdirect.gov.au/nervous-system). It is found in foods and drinks like: - coffee - tea leaves - cocoa beans - guarana — a South American plant with high levels of natural caffeine - chocolate - cola drinks - energy drinks Caffeine can also be found in small amounts in some prescription and [over-the-counter medicines](https://www.healthdirect.gov.au/over-the-counter-medicines), such as some: - [pain-relief medicines](https://www.healthdirect.gov.au/pain-relief-medicines) - cough medicines - weight loss products ## How much caffeine is in food and drink? The amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee. \| Source \| Caffeine \| \|---\|---\| \| Espresso (50 millilitre (mL) cup) \| 145 milligrams (mg) \| \| Energy drink (250mL can) \| 80 mg \| \| Instant coffee (1 teaspoon) \| 80 mg \| \| Black tea (220mL cup) \| 50 mg \| \| Cola (375mL can) \| 36 mg \| \| Milk chocolate (50 gram (g) bar) \| 10 mg \| ## How will caffeine affect my body? Caffeine affects everyone differently. The effect of caffeine depends on: - your age, height and weight - your general health and if you have a medical condition - the amount you eat or drink - genetic factors - whether you regularly eat or drink caffeine - whether other food or drugs (including alcohol) are taken at the same time - your mood The short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual. Short-term effects after a small amount of caffeine (100-200mg) can be: - feeling more alert and active - higher body temperature - faster breathing and heart rate It's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients. ## What are the side effects or risks of consuming caffeine? The amount of caffeine that is safe to have depends on your health and your age. Healthy adults can safely have around 400mg of caffeine a day. This is the same as: - 2 espressos - 4 instant coffees - 8 cups of black tea Many regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink. Regular heavy use of caffeine, more than 600mg a day, can cause: - increased production of stomach acid causing [heartburn](https://www.healthdirect.gov.au/heartburn) - [stomach ulcers](https://www.healthdirect.gov.au/stomach-ulcers) - [osteoporosis](https://www.healthdirect.gov.au/osteoporosis) (bone loss) in post-menopausal women - [insomnia](https://www.healthdirect.gov.au/insomnia) (difficulty sleeping) - [anxiety](https://www.healthdirect.gov.au/anxiety) and [depression](https://www.healthdirect.gov.au/depression) If you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice. Children and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods. Older people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer. Caffeine also stays active for longer in the bodies of babies and [pregnant people](https://www.pregnancybirthbaby.org.au/caffeine-during-pregnancy). If you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of: - [miscarriage](https://www.pregnancybirthbaby.org.au/miscarriage) and [stillbirth](https://www.pregnancybirthbaby.org.au/what-is-a-stillbirth) - low birth weight - delays in your baby's development during pregnancy If you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as: - 1 espresso - 2 instant coffees - 4 cups of tea Much of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine. ## What are the health benefits of consuming caffeine? The effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others. Because caffeine is a stimulant, it can make you feel more alert and energetic. There is some evidence that caffeine might lower the chance of developing: - [Alzheimer's disease](https://www.healthdirect.gov.au/alzheimers-disease) - [type 2 diabetes](https://www.healthdirect.gov.au/type-2-diabetes) - [Parkinson's disease](https://www.healthdirect.gov.au/parkinsons-disease) - [cancer](https://www.healthdirect.gov.au/cancer-types) - [liver disease](https://www.healthdirect.gov.au/liver-conditions-and-diseases) - [depression](https://www.healthdirect.gov.au/depression) and suicide Most of these studies have looked at caffeine from coffee only. ## Mixing caffeine with alcohol and other drugs Drinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm. ### Caffeine and medicines Caffeine can interact with [over-the-counter](https://www.healthdirect.gov.au/over-the-counter-medicines) and prescription medicines, such as: - [antibiotics](https://www.healthdirect.gov.au/antibiotics) - [oral contraceptives](https://www.healthdirect.gov.au/the-pill-combined-oral-contraceptive-pill) - some antidepressants - some heart medicines Ask your pharmacist or doctor if any medicines that you take could be affected by caffeine. ### Caffeine, alcohol and illicit drugs When you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours. Caffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night. Caffeine can also interact with other stimulants such as [cocaine](https://www.healthdirect.gov.au/cocaine) and [methamphetamine](https://www.healthdirect.gov.au/ice-crystal-meth). It can increase your chance of problems such as an abnormal health rate or [heart rhythm](https://www.healthdirect.gov.au/heart-arrhythmias). ## How can I reduce my caffeine intake? If you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day. If you drink coffee, you can reduce your intake by switching to decaffeinated coffee. If you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas. If you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead. If you want to reduce your caffeine intake, check [food and drink ingredient lists](https://www.healthdirect.gov.au/how-to-read-food-labels) for caffeine. ## Caffeine withdrawal syndrome If you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include: - [headaches](https://www.healthdirect.gov.au/headaches) - [tiredness](https://www.healthdirect.gov.au/fatigue) - [irritability](https://www.healthdirect.gov.au/irritability-and-feeling-on-edge) - [nausea](https://www.healthdirect.gov.au/nausea) - [depression](https://www.healthdirect.gov.au/depression) and [anxiety](https://www.healthdirect.gov.au/anxiety) - sweating - difficulty concentrating If you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week. ## Resources and support You can find out more about caffeine through the [Alcohol and Drug Foundation](https://adf.org.au/) — call their Drug Info and Advice Line on [1300 85 85 84](tel:1300858584). You can also call the healthdirect helpline on [1800 022 222](tel:1800022222) (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week. #### Sources: Alcohol and Drug Foundation [(Caffeine)](https://adf.org.au/drug-facts/caffeine/ "Caffeine"), European Journal of Medicinal Chemistry Reports [(Pharmacology of caffeine and its effects on the human body)](https://www.sciencedirect.com/science/article/pii/S2772417424000104?ref=pdf_download&fr=RR-2&rr=96b5e46f7f92e7e4 "Pharmacology of caffeine and its effects on the human body"), JAMA Network [(Caffeine and Health)](https://jamanetwork.com/journals/jama/fullarticle/2789026 "Caffeine and Health"), Food Standards Australia & New Zealand [(Caffeine)](https://www.foodstandards.gov.au/consumer/prevention-of-foodborne-illness/caffeine "Caffeine"), State Library NSW [(Caffeine)](https://www.sl.nsw.gov.au/drug-info/drugs/z-drugs/caffeine "Caffeine"), Australian Breastfeeding Association [(Caffeine and breastfeeding)](https://www.breastfeeding.asn.au/resources/caffeine-and-breastfeeding "Caffeine and breastfeeding") Learn more here about the [development and quality assurance of healthdirect content](https://www.healthdirect.gov.au/about-our-content). Last reviewed: August 2025 [Back To Top](https://www.healthdirect.gov.au/caffeine#backToTop) ## Search our site for - [Coffee](https://www.healthdirect.gov.au/search-results/Coffee "Search results for: Coffee") - [Chocolate](https://www.healthdirect.gov.au/search-results/Chocolate "Search results for: Chocolate") - [Soft Drinks](https://www.healthdirect.gov.au/search-results/Soft%20Drinks "Search results for: Soft Drinks") - [Tea](https://www.healthdirect.gov.au/search-results/Tea "Search results for: Tea") ## Need more information? These trusted information partners have more on this topic. General search results Results for medical professionals Top results [Caffeine \\| Your Fertility Are you trying to conceive and wondering if caffeine is affecting your Fertility? Visit the health and medical section of our website for more information. Read more on Your Fertility website ![Your Fertility](https://media.healthdirect.org.au/images/logos/h40/YourFertility_logo.png)](https://www.yourfertility.org.au/everyone/drugs-chemicals/caffeine) [Caffeine - Alcohol and Drug Foundation Discover how caffeine affects your body and mind as the world's most consumed stimulant. Learn about sources, recommended limits, withdrawal symptoms, and health impacts. Read more on Alcohol and Drug Foundation website ![Alcohol and Drug Foundation](https://media.healthdirect.org.au/images/logos/h40/Australian-Drug-Foundation_logo.png)](https://adf.org.au/drug-facts/caffeine/) [Caffeine and Energy Drinks Effects and Withdrawal Symptoms \\| Your Room Caffeine and energy drinks, when consumed in large quantities, can cause unwanted side effects. Find out about withdrawal symptoms and other FAQs. Read more on NSW Health website ![NSW Health](https://media.healthdirect.org.au/images/logos/h40/NSW-Health.png)](https://yourroom.health.nsw.gov.au/a-z-of-drugs/Pages/energy-drinks-and-caffeine.aspx) [Caffeine and Sleep \\| Sleep Health Foundation This is a fact sheet about Caffeine and Sleep. Caffeine can have a significant impact on falling asleep and staying asleep. Read more on Sleep Health Foundation website ![Sleep Health Foundation](https://media.healthdirect.org.au/images/logos/h40/sleephealthfoundation_logo-teal-a37684.png)](https://www.sleephealthfoundation.org.au/sleep-topics/caffeine-and-sleep) [Caffeine \\| Better Health Channel Caffeine is a stimulant that acts on the brain and nervous system. Read more on Better Health Channel website ![Better Health Channel](https://media.healthdirect.org.au/images/logos/h40/bhc-rectangle-image-e99950.png)](https://www.betterhealth.vic.gov.au/health/healthyliving/caffeine) [Caffeine during pregnancy and breastfeeding Some foods, drinks and medicines contain caffeine. Read about safe use during pregnancy and breastfeeding, risks, and alternatives. Read more on Pregnancy,Birth & Baby website ![Pregnancy,Birth & Baby](https://media.healthdirect.org.au/images/logos/h40/PBB_logo.png)](https://www.pregnancybirthbaby.org.au/caffeine-during-pregnancy) Show more Top results Show more ## Disclaimer Healthdirect Australia is not responsible for the content and advertising on the external website you are now entering. [OK]() ## Search our site for - [Coffee](https://www.healthdirect.gov.au/search-results/Coffee "Search results for: Coffee") - [Chocolate](https://www.healthdirect.gov.au/search-results/Chocolate "Search results for: Chocolate") - [Soft Drinks](https://www.healthdirect.gov.au/search-results/Soft%20Drinks "Search results for: Soft Drinks") - [Tea](https://www.healthdirect.gov.au/search-results/Tea "Search results for: Tea") ## Symptom checker Worried about your health? 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Readable Markdown	## Key facts - Caffeine is a stimulant that acts on your brain and nervous system. - It is found naturally in coffee, tea leaves, cocoa beans, guarana and chocolate. - Caffeine is addictive and you may develop withdrawal symptoms when reducing your intake. ## On this page - [What is caffeine?](https://www.healthdirect.gov.au/caffeine#what-is) - [How much caffeine is in food and drink?](https://www.healthdirect.gov.au/caffeine#how-much) - [How will caffeine affect my body?](https://www.healthdirect.gov.au/caffeine#affect) - [What are the side effects or risks of consuming caffeine?](https://www.healthdirect.gov.au/caffeine#side-effects) - [What are the health benefits of consuming caffeine?](https://www.healthdirect.gov.au/caffeine#health-benefits) - [Mixing caffeine with alcohol and other drugs](https://www.healthdirect.gov.au/caffeine#mixing) - [How can I reduce my caffeine intake?](https://www.healthdirect.gov.au/caffeine#reduce) - [Caffeine withdrawal syndrome](https://www.healthdirect.gov.au/caffeine#withdrawal) - [Resources and support](https://www.healthdirect.gov.au/caffeine#resources) - [Related information on Australian websites](https://www.healthdirect.gov.au/caffeine#searchGeneralResults) ## What is caffeine? Caffeine is a chemical that can stimulate your brain and [nervous system](https://www.healthdirect.gov.au/nervous-system). It is found in foods and drinks like: - coffee - tea leaves - cocoa beans - guarana — a South American plant with high levels of natural caffeine - chocolate - cola drinks - energy drinks Caffeine can also be found in small amounts in some prescription and [over-the-counter medicines](https://www.healthdirect.gov.au/over-the-counter-medicines), such as some: - [pain-relief medicines](https://www.healthdirect.gov.au/pain-relief-medicines) - cough medicines - weight loss products ## How much caffeine is in food and drink? The amount of caffeine in food and drinks varies. For example, an espresso has more caffeine than instant coffee. \| Source \| Caffeine \| \|---\|---\| \| Espresso (50 millilitre (mL) cup) \| 145 milligrams (mg) \| \| Energy drink (250mL can) \| 80 mg \| \| Instant coffee (1 teaspoon) \| 80 mg \| \| Black tea (220mL cup) \| 50 mg \| \| Cola (375mL can) \| 36 mg \| \| Milk chocolate (50 gram (g) bar) \| 10 mg \| ## How will caffeine affect my body? Caffeine affects everyone differently. The effect of caffeine depends on: - your age, height and weight - your general health and if you have a medical condition - the amount you eat or drink - genetic factors - whether you regularly eat or drink caffeine - whether other food or drugs (including alcohol) are taken at the same time - your mood The short-term effects of caffeine typically happen after about 30 minutes. They can last for up to 6 hours, depending on the individual. Short-term effects after a small amount of caffeine (100-200mg) can be: - feeling more alert and active - higher body temperature - faster breathing and heart rate It's not always clear how your body will respond to caffeine. Much of the research in this area has been in coffee, which contains caffeine and many other ingredients. ## What are the side effects or risks of consuming caffeine? The amount of caffeine that is safe to have depends on your health and your age. Healthy adults can safely have around 400mg of caffeine a day. This is the same as: - 2 espressos - 4 instant coffees - 8 cups of black tea Many regular coffee drinkers become dependent on caffeine. You may be dependent on caffeine if you find it hard to reduce how much you drink. Regular heavy use of caffeine, more than 600mg a day, can cause: - increased production of stomach acid causing [heartburn](https://www.healthdirect.gov.au/heartburn) - [stomach ulcers](https://www.healthdirect.gov.au/stomach-ulcers) - [osteoporosis](https://www.healthdirect.gov.au/osteoporosis) (bone loss) in post-menopausal women - [insomnia](https://www.healthdirect.gov.au/insomnia) (difficulty sleeping) - [anxiety](https://www.healthdirect.gov.au/anxiety) and [depression](https://www.healthdirect.gov.au/depression) If you have a medical condition, it's a good idea to eat or drink less caffeine. For example, if you have high blood pressure, caffeine can increase your blood pressure. You can speak to your doctor for advice. Children and young people who drink energy drinks that contain caffeine may have side effects like bed wetting and sleep problems. Children under 18 years of age should have less than 2.5mg of caffeine a day, for each kilogram (kg) of body weight. For a 40kg child, this is about 120mg a day, or 3 cans of cola (375mL). Having too much caffeine can cause anxiety. Foods with caffeine in your diet can take up space for other nutritious foods. Older people can be more sensitive to the effects of caffeine. This is because it stays active in their bodies for longer. Caffeine also stays active for longer in the bodies of babies and [pregnant people](https://www.pregnancybirthbaby.org.au/caffeine-during-pregnancy). If you are pregnant, caffeine can pass to your baby through the placenta. There is evidence to show that having drinks that contain caffeine during pregnancy can increase the risk of: - [miscarriage](https://www.pregnancybirthbaby.org.au/miscarriage) and [stillbirth](https://www.pregnancybirthbaby.org.au/what-is-a-stillbirth) - low birth weight - delays in your baby's development during pregnancy If you are pregnant or breastfeeding, it's a good idea to limit your intake of caffeine to 200mg per day. This is the same as: - 1 espresso - 2 instant coffees - 4 cups of tea Much of the research into the effects of caffeine has only looked at coffee. We still don't know much about the effects of other foods and drinks that contain caffeine. ## What are the health benefits of consuming caffeine? The effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others. Because caffeine is a stimulant, it can make you feel more alert and energetic. There is some evidence that caffeine might lower the chance of developing: - [Alzheimer's disease](https://www.healthdirect.gov.au/alzheimers-disease) - [type 2 diabetes](https://www.healthdirect.gov.au/type-2-diabetes) - [Parkinson's disease](https://www.healthdirect.gov.au/parkinsons-disease) - [cancer](https://www.healthdirect.gov.au/cancer-types) - [liver disease](https://www.healthdirect.gov.au/liver-conditions-and-diseases) - [depression](https://www.healthdirect.gov.au/depression) and suicide Most of these studies have looked at caffeine from coffee only. ## Mixing caffeine with alcohol and other drugs Drinking or eating caffeine when taking other drugs can cause unpredictable effects. This can increase your chance of harm. ### Caffeine and medicines Caffeine can interact with [over-the-counter](https://www.healthdirect.gov.au/over-the-counter-medicines) and prescription medicines, such as: - [antibiotics](https://www.healthdirect.gov.au/antibiotics) - [oral contraceptives](https://www.healthdirect.gov.au/the-pill-combined-oral-contraceptive-pill) - some antidepressants - some heart medicines Ask your pharmacist or doctor if any medicines that you take could be affected by caffeine. ### Caffeine, alcohol and illicit drugs When you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours. Caffeine does not affect the way your body absorbs alcohol. It will not reduce your blood alcohol concentration or help you 'sober up' after a big night. Caffeine can also interact with other stimulants such as [cocaine](https://www.healthdirect.gov.au/cocaine) and [methamphetamine](https://www.healthdirect.gov.au/ice-crystal-meth). It can increase your chance of problems such as an abnormal health rate or [heart rhythm](https://www.healthdirect.gov.au/heart-arrhythmias). ## How can I reduce my caffeine intake? If you want to reduce or stop having caffeine, it's a good idea to do this over time. For example, drink one less caffeinated drink each day. If you drink coffee, you can reduce your intake by switching to decaffeinated coffee. If you drink tea, you can leave your teabag to brew for less time. You can also switch to herbal teas. If you drink soft drinks that contain caffeine (such as cola drinks), switch to options without caffeine. You can also drink water instead. If you want to reduce your caffeine intake, check [food and drink ingredient lists](https://www.healthdirect.gov.au/how-to-read-food-labels) for caffeine. ## Caffeine withdrawal syndrome If you stop regularly having caffeine, you may develop withdrawal syndrome. Symptoms usually start within a day of stopping caffeine. These symptoms can last up to a week. They include: - [headaches](https://www.healthdirect.gov.au/headaches) - [tiredness](https://www.healthdirect.gov.au/fatigue) - [irritability](https://www.healthdirect.gov.au/irritability-and-feeling-on-edge) - [nausea](https://www.healthdirect.gov.au/nausea) - [depression](https://www.healthdirect.gov.au/depression) and [anxiety](https://www.healthdirect.gov.au/anxiety) - sweating - difficulty concentrating If you drink a very large amount of caffeine regularly, withdrawal symptoms may last for more than a week. ## Resources and support You can find out more about caffeine through the [Alcohol and Drug Foundation](https://adf.org.au/) — call their Drug Info and Advice Line on [1300 85 85 84](tel:1300858584). You can also call the healthdirect helpline on [1800 022 222](tel:1800022222) (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with you 24 hours a day, 7 days a week.
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