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URLhttps://my.clevelandclinic.org/health/treatments/antivirals
Last Crawled2026-04-19 15:08:21 (3 days ago)
First Indexed2024-07-04 13:33:47 (1 year ago)
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Meta TitleAntiviral (Antiviral Medication): What It Is & How It Works
Meta DescriptionAntivirals treat viruses and prevent them from spreading. They’re effective against flu, herpes, HIV and other contagious viral infections.
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What are the benefits of taking antivirals? Antivirals can reduce the severity of symptoms you experience and make some infections clear up (get better) faster than they would without treatment. In some cases, antiviral medications can save your life or prevent severe complications that the infection would cause if it wasn’t treated. Can antivirals cure viral infections? It depends on which type of viral infection you have. Some viral infections can be cured, but others cause chronic (long-term) conditions that we can’t cure yet. Antivirals can eliminate some viruses like the flu and Ebola. They can rid your body of these viruses. Viral infections like HIV, hepatitis and herpes are chronic. Antivirals can’t get rid of these viruses once you have them in your body. But antiviral medicines can make chronic viruses latent (inactive) so you have few, if any, symptoms. Symptoms that develop while you take antivirals may be less severe or go away faster. Can antivirals prevent the spread of viral infections? Yes, antiviral drugs can keep you from getting certain viral infections after you’re exposed to them. They can also reduce the risk that you spread an infection to others. For example, taking antivirals: Within 48 hours (two days) of exposure to the flu may keep you from getting sick. Within 72 hours (three days) of a potential HIV exposure can lower the chances you get infected. Every day can lower the risk of passing herpes or HIV to others or getting them from a sexual partner who has it. During pregnancy lowers the risk of a pregnant woman passing a virus they have to the fetus (babies will also receive antivirals after they’re born). Are antivirals safe? Yes, antivirals are safe if you take them when a healthcare provider prescribes them to you. Make sure you follow all the instructions and take your antivirals as often (and for as long) as your provider prescribes. It’s usually safe to take an antiviral along with other medications. But tell your provider about any other prescriptions you’re taking and any over-the-counter (OTC) medications or herbal supplements you use. They’ll tell you which medications or supplements you should change, stop using or temporarily avoid while you’re taking antivirals. What are the side effects of antiviral drugs? Antiviral side effects can vary depending on which medication you’re taking and how strong the dose is. You may experience: Don’t stop taking your antiviral medication unless your provider tells you to, even if you’re experiencing side effects. Skipping doses or starting and stopping an antiviral medicine can allow a virus to adapt to the medication so it’s no longer effective ( antiviral resistance ). People who take antivirals for a long time to manage chronic infections are more likely to have antiviral resistance. Talk to your healthcare provider about any potential side effects from your medications. They’ll let you know what to expect and will tell you when you should stop or change your medication’s dosage.
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![](https://zdbb.net/l/Dnl1wmWs8xCCpvWNCt9Egf/?w=16&q=75) Locations: [Abu Dhabi](https://www.clevelandclinicabudhabi.ae/en)\|[Canada](https://my.clevelandclinic.org/canada)\|[Florida](https://my.clevelandclinic.org/florida)\|[London](https://clevelandcliniclondon.uk/)\|[Nevada](https://my.clevelandclinic.org/locations/nevada)\|[Ohio](https://my.clevelandclinic.org/)\| ![Gray gradient](https://my.clevelandclinic.org/_next/static/media/gray-gradient-left-16.59910877.svg?w=32&q=75)![Gray gradient](https://my.clevelandclinic.org/_next/static/media/gray-gradient-right-32.dd7ce4e5.svg?w=64&q=75) [855\.733.3712](tel:8557333712)\|[MyChart](https://my.clevelandclinic.org/online-services/mychart)\|[Need Help?](https://my.clevelandclinic.org/help)\|[Careers](https://jobs.clevelandclinic.org/)\|[Donate Now](https://give.ccf.org/give/187824#!/donation/checkout)\| ![Gray gradient](https://my.clevelandclinic.org/_next/static/media/gray-gradient-left-16.59910877.svg?w=32&q=75)![Gray gradient](https://my.clevelandclinic.org/_next/static/media/gray-gradient-right-32.dd7ce4e5.svg?w=64&q=75) [![Cleveland Clinic logo](https://assets.clevelandclinic.org/transform/1bc1ff31-3cbc-4976-9ddf-9bc85e0877eb/Cleveland-Clinic-Logo-Web?w=3840&q=75)](https://my.clevelandclinic.org/) [Find a Provider](https://my.clevelandclinic.org/providers)[Locations and Directions](https://my.clevelandclinic.org/locations)[Services](https://my.clevelandclinic.org/services)[Patients and Visitors](https://my.clevelandclinic.org/patients)[Health Library](https://my.clevelandclinic.org/health) - [Find a Provider](https://my.clevelandclinic.org/providers) - [Locations and Directions](https://my.clevelandclinic.org/locations) - [Services](https://my.clevelandclinic.org/services) - [Patients and Visitors](https://my.clevelandclinic.org/patients) - [Health Library](https://my.clevelandclinic.org/health) [![Search](https://my.clevelandclinic.org/_next/static/media/LondonGreenSearchIcon.6d7e718f.svg?w=64&q=75)](https://my.clevelandclinic.org/search) Menu [![Search](https://my.clevelandclinic.org/_next/static/media/LondonGreenSearchIcon.6d7e718f.svg?w=64&q=75)](https://my.clevelandclinic.org/search)[Appointments](https://my.clevelandclinic.org/patients/information/access) [Home](https://my.clevelandclinic.org/)/ [Health Library](https://my.clevelandclinic.org/health)/ [Medical Treatments](https://my.clevelandclinic.org/health/treatments)/ Antivirals Advertisement Advertisement # Antivirals Medically Reviewed. Last updated on 07/23/2024. Antiviral medications help your body fight off harmful viruses. These drugs can ease symptoms and shorten the length of a viral infection. Antivirals also lower the risk of getting or spreading viruses that cause herpes and HIV. Several approved antivirals treat the coronavirus that causes COVID-19. Advertisement Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. [Policy](https://health.clevelandclinic.org/advertising) Care at Cleveland Clinic [Find a Primary Care Provider](https://my.clevelandclinic.org/services/primary-care) [Schedule an Appointment](https://my.clevelandclinic.org/services/primary-care#call-to-action-panel) Contents [Overview](https://my.clevelandclinic.org/health/treatments/antivirals#overview)[Risks / Benefits](https://my.clevelandclinic.org/health/treatments/antivirals#risks-benefits)[Recovery and Outlook](https://my.clevelandclinic.org/health/treatments/antivirals#recovery-and-outlook)[When To Call the Doctor](https://my.clevelandclinic.org/health/treatments/antivirals#when-to-call-the-doctor)[Additional Common Questions](https://my.clevelandclinic.org/health/treatments/antivirals#additional-common-questions) Contents [Overview](https://my.clevelandclinic.org/health/treatments/antivirals#overview)[Risks / Benefits](https://my.clevelandclinic.org/health/treatments/antivirals#risks-benefits)[Recovery and Outlook](https://my.clevelandclinic.org/health/treatments/antivirals#recovery-and-outlook)[When To Call the Doctor](https://my.clevelandclinic.org/health/treatments/antivirals#when-to-call-the-doctor)[Additional Common Questions](https://my.clevelandclinic.org/health/treatments/antivirals#additional-common-questions) ## Overview ### What are antivirals? Antivirals are medications that help your body fight off certain [viruses](https://my.clevelandclinic.org/health/body/24861-virus) that can cause disease. Antiviral drugs are also preventive. This means they can protect you from getting [viral infections](https://my.clevelandclinic.org/health/diseases/24473-viral-infection) or spreading a virus to others. Healthcare providers sometimes call taking antivirals antiviral therapy. Advertisement Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. [Policy](https://health.clevelandclinic.org/advertising) ### What do antivirals treat? Most viruses clear up without antiviral medications. Healthcare providers prescribe antivirals to treat life-threatening or chronic (long-term) viral infections, including: - [Coronaviruses](https://my.clevelandclinic.org/health/diseases/21214-coronavirus-covid-19) like [COVID-19](https://my.clevelandclinic.org/health/diseases/21214-coronavirus-covid-19). - [Ebola](https://my.clevelandclinic.org/health/diseases/15606-ebola-virus-disease). - [Flu](https://my.clevelandclinic.org/health/diseases/4335-influenza-flu), including [H1N1 (swine flu)](https://my.clevelandclinic.org/health/diseases/23928-swine-flu-h1n1). - [Herpes](https://my.clevelandclinic.org/health/diseases/22855-herpes-simplex). - [Hepatitis B](https://my.clevelandclinic.org/health/diseases/4246-hepatitis-b) and [hepatitis C](https://my.clevelandclinic.org/health/diseases/15664-hepatitis-c). - [Human immunodeficiency virus (HIV)](https://my.clevelandclinic.org/health/diseases/4251-aids--hiv). - [Mpox](https://my.clevelandclinic.org/health/diseases/22371-monkeypox). ### What do antiviral drugs do? Antiviral medications help your body fight off infections. They’re like extra reinforcements that work alongside your body’s natural defenses to keep you safe from the invading virus. They do this in three different ways: - Blocking receptors so viruses can’t bind to and enter healthy cells in your body. - Boosting your [immune system](https://my.clevelandclinic.org/health/articles/21196-immune-system) (your body’s natural defense system) to help it fight off a viral infection. - Lowering the viral load (amount of active virus) in your body. ### How do you take antiviral drugs? Most antivirals are oral drugs you swallow as pills. But you may also receive antiviral medications as: - Eye drops. - Inhaled powder. - Injections (shots) into a [muscle](https://my.clevelandclinic.org/health/body/21887-muscle). - IV (intravenous) infusions into a [vein](https://my.clevelandclinic.org/health/body/23360-veins). - Topical ointments or creams that you rub into your [skin](https://my.clevelandclinic.org/health/body/10978-skin). ## Risks / Benefits ### What are the benefits of taking antivirals? Antivirals can reduce the severity of symptoms you experience and make some infections clear up (get better) faster than they would without treatment. In some cases, antiviral medications can save your life or prevent severe complications that the infection would cause if it wasn’t treated. Advertisement #### Can antivirals cure viral infections? It depends on which type of viral infection you have. Some viral infections can be cured, but others cause chronic (long-term) conditions that we can’t cure yet. Antivirals can eliminate some viruses like the flu and Ebola. They can rid your body of these viruses. Viral infections like HIV, hepatitis and herpes are chronic. Antivirals can’t get rid of these viruses once you have them in your body. But antiviral medicines can make chronic viruses latent (inactive) so you have few, if any, symptoms. Symptoms that develop while you take antivirals may be less severe or go away faster. #### Can antivirals prevent the spread of viral infections? Yes, antiviral drugs can keep you from getting certain viral infections after you’re exposed to them. They can also reduce the risk that you spread an infection to others. For example, taking antivirals: - **Within 48 hours (two days)** of exposure to the flu may keep you from getting sick. - **Within 72 hours (three days)** of a potential HIV exposure can lower the chances you get infected. - **Every day** can lower the risk of passing herpes or HIV to others or getting them from a sexual partner who has it. - **During pregnancy** lowers the risk of a pregnant [woman](https://my.clevelandclinic.org/health/articles/sex-recorded-at-birth) passing a virus they have to the fetus (babies will also receive antivirals after they’re born). #### Are antivirals safe? Yes, antivirals are safe if you take them when a healthcare provider prescribes them to you. Make sure you follow all the instructions and take your antivirals as often (and for as long) as your provider prescribes. It’s usually safe to take an antiviral along with other medications. But tell your provider about any other prescriptions you’re taking and any over-the-counter (OTC) medications or herbal supplements you use. They’ll tell you which medications or supplements you should change, stop using or temporarily avoid while you’re taking antivirals. ### What are the side effects of antiviral drugs? Antiviral side effects can vary depending on which medication you’re taking and how strong the dose is. You may experience: - [Cough](https://my.clevelandclinic.org/health/symptoms/17755-cough). - [Dry mouth](https://my.clevelandclinic.org/health/symptoms/10902-dry-mouth-xerostomia). - [Diarrhea](https://my.clevelandclinic.org/health/diseases/4108-diarrhea). - [Dizziness](https://my.clevelandclinic.org/health/symptoms/6422-dizziness). - [Fatigue](https://my.clevelandclinic.org/health/symptoms/21206-fatigue). - [Headaches](https://my.clevelandclinic.org/health/diseases/9639-headaches). - [Insomnia](https://my.clevelandclinic.org/health/diseases/12119-insomnia). - [Joint pain](https://my.clevelandclinic.org/health/symptoms/17752-joint-pain) - [Muscle pain](https://my.clevelandclinic.org/health/symptoms/17669-muscle-pain). - [Nausea](https://my.clevelandclinic.org/health/symptoms/nausea) and [vomiting](https://my.clevelandclinic.org/health/symptoms/vomiting). - [Skin rash](https://my.clevelandclinic.org/health/diseases/17413-rashes-red-skin). Don’t stop taking your antiviral medication unless your provider tells you to, even if you’re experiencing side effects. Skipping doses or starting and stopping an antiviral medicine can allow a virus to adapt to the medication so it’s no longer effective ([antiviral resistance](https://my.clevelandclinic.org/health/articles/23217-antiviral-resistance)). People who take antivirals for a long time to manage chronic infections are more likely to have antiviral resistance. Advertisement Talk to your healthcare provider about any potential side effects from your medications. They’ll let you know what to expect and will tell you when you should stop or change your medication’s dosage. ## Recovery and Outlook ### How long do you need to take antiviral medications? How long you’ll need an antiviral varies depending on which medication you need and the infection you have. For example, you might only need a week or two of some oral medications. And some antivirals delivered via IV only need a single infusion. If you have a chronic infection like HIV, you may need to take antivirals every day for the rest of your life. Daily doses of your medication can keep the virus from becoming active and reduce the chances it can pass to others. ## When To Call the Doctor ### When should I see my healthcare provider? Your provider will tell you when you’ll need follow-up appointments or tests. They’ll monitor your body for changes and make sure the antiviral is managing the infection you have. If you have a chronic condition, you’ll need regular checkups to manage the infection and check your overall health. Talk to your provider if you experience severe side effects or if you notice new or worsening infection symptoms. Don’t stop taking your medication unless your provider says it’s safe to. ## Additional Common Questions ### What is the difference between an antiviral and an antibiotic? Antivirals and antibiotics are both medications that help your body fight infections. The difference is which type of infection they treat. Advertisement Antivirals treat and prevent viral infections. Each antiviral only works against a specific virus. Because viruses inside cells are harder to target, antiviral drugs are more challenging to develop. There are more viruses than antiviral drugs to treat them. [Antibiotics](https://my.clevelandclinic.org/health/drugs/16386-antibiotics) help your immune system fight off bacterial infections. One type of antibiotic can usually treat many different kinds of [bacterial infections](https://my.clevelandclinic.org/health/diseases/24189-bacterial-infection). But they don’t work on viruses. ### A note from Cleveland Clinic Antivirals can be lifesaving medications. You might need them temporarily while you treat and recover from a short-term infection. But you might also need to take antivirals for the rest of your life to manage a chronic condition. No matter why you need them, never hesitate to talk to your provider if you’re worried about the infection, your medication or side effects you’re experiencing. You know your body better than anyone — if something feels worse, different or strange, let your provider know right away. They’ll help you adjust your medication and or other treatments. Advertisement [![Cleveland Clinic logo](https://my.clevelandclinic.org/_next/static/media/logo-ccf.1e52a22b.svg?w=3840&q=75)](https://my.clevelandclinic.org/)[![Cleveland Clinic icon](https://my.clevelandclinic.org/_next/static/media/CCFLogo.000428c6.svg?w=3840&q=75)](https://my.clevelandclinic.org/) [![Health Essentials logo](https://my.clevelandclinic.org/_next/static/media/HealthEssentials.b811bb06.svg?w=3840&q=75)](https://health.clevelandclinic.org/) ![Subscription icon](https://assets.clevelandclinic.org/transform/482db8cd-aa1e-45b5-a2a4-cf6aa5e5d2d4/Health-Essentials?w=256&q=75) ## Better health starts here Sign up for our Health Essentials emails for expert guidance on nutrition, fitness, sleep, skin care and more. 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Last updated on 07/23/2024. ### References Cleveland Clinic’s health articles are based on evidence-backed information and review by medical professionals to ensure accuracy, reliability and up-to-date clinical standards. - Centers for Disease Control and Prevention (U.S.). Let’s Stop HIV Together *(https://www.cdc.gov/stophivtogether/hiv-treatment/)*. Last reviewed 2/7/2024. Accessed 7/23/2024. - Merck Manual (Consumer Version). Overview of Viral Infections *(https://www.merckmanuals.com/home/infections/overview-of-viral-infections/overview-of-viral-infections)*. Last reviewed 3/2023. Accessed 7/23/2024. - National Institutes of Health (U.S.). COVID-19 Treatment Guidelines *(https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/)*. Last updated 2/29/2024. Accessed 7/23/2024. - United States Food and Drug Administration. Influenza (Flu) Antiviral Drugs and Related Information *(https://www.fda.gov/drugs/information-drug-class/influenza-flu-antiviral-drugs-and-related-information)*. Last updated 12/8/2022. Accessed 7/23/2024. - Vardanyan R, Hruby V. Antiviral Drugs *(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7149618/)*. *Synthesis of Best-Seller Drugs*. 2016;687-736. Accessed 7/23/2024. ### Care at Cleveland Clinic Cleveland Clinic’s primary care providers offer lifelong medical care. 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### What are the benefits of taking antivirals? Antivirals can reduce the severity of symptoms you experience and make some infections clear up (get better) faster than they would without treatment. In some cases, antiviral medications can save your life or prevent severe complications that the infection would cause if it wasn’t treated. #### Can antivirals cure viral infections? It depends on which type of viral infection you have. Some viral infections can be cured, but others cause chronic (long-term) conditions that we can’t cure yet. Antivirals can eliminate some viruses like the flu and Ebola. They can rid your body of these viruses. Viral infections like HIV, hepatitis and herpes are chronic. Antivirals can’t get rid of these viruses once you have them in your body. But antiviral medicines can make chronic viruses latent (inactive) so you have few, if any, symptoms. Symptoms that develop while you take antivirals may be less severe or go away faster. #### Can antivirals prevent the spread of viral infections? Yes, antiviral drugs can keep you from getting certain viral infections after you’re exposed to them. They can also reduce the risk that you spread an infection to others. For example, taking antivirals: - **Within 48 hours (two days)** of exposure to the flu may keep you from getting sick. - **Within 72 hours (three days)** of a potential HIV exposure can lower the chances you get infected. - **Every day** can lower the risk of passing herpes or HIV to others or getting them from a sexual partner who has it. - **During pregnancy** lowers the risk of a pregnant [woman](https://my.clevelandclinic.org/health/articles/sex-recorded-at-birth) passing a virus they have to the fetus (babies will also receive antivirals after they’re born). #### Are antivirals safe? Yes, antivirals are safe if you take them when a healthcare provider prescribes them to you. Make sure you follow all the instructions and take your antivirals as often (and for as long) as your provider prescribes. It’s usually safe to take an antiviral along with other medications. But tell your provider about any other prescriptions you’re taking and any over-the-counter (OTC) medications or herbal supplements you use. They’ll tell you which medications or supplements you should change, stop using or temporarily avoid while you’re taking antivirals. ### What are the side effects of antiviral drugs? Antiviral side effects can vary depending on which medication you’re taking and how strong the dose is. You may experience: Don’t stop taking your antiviral medication unless your provider tells you to, even if you’re experiencing side effects. Skipping doses or starting and stopping an antiviral medicine can allow a virus to adapt to the medication so it’s no longer effective ([antiviral resistance](https://my.clevelandclinic.org/health/articles/23217-antiviral-resistance)). People who take antivirals for a long time to manage chronic infections are more likely to have antiviral resistance. Talk to your healthcare provider about any potential side effects from your medications. They’ll let you know what to expect and will tell you when you should stop or change your medication’s dosage.
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