Centers for Disease Control and Prevention
Seasonal Influenza (Flu)
What You Should Know About Flu Antiviral DrugsWhat are antiviral drugs?Antiviral drugs are prescription medicines (pills, liquid or an inhaled powder) that fight against the flu in your body. While CDC recommends flu vaccine as the first and most important step in preventing flu, antiviral drugs are a second line of defense against the flu. Antiviral drugs are not sold over-the-counter and are different from antibiotics. You can only get them if you have a prescription from your doctor or health care provider.
What antiviral drugs are recommended this flu season?There are two antiviral drugs recommended by CDC this season. The brand names for these are Tamiflu® and Relenza® (The generic names for these drugs are oseltamivir and zanamivir). Tamiflu® is available as a pill or liquid and Relenza® is a powder that is inhaled.
Who should take antiviral drugs?It’s very important that antiviral drugs be used early to treat flu in people who are very sick with flu (for example people who are in the hospital) and people who are sick with flu and have a greater chance of getting serious flu complications (see box) [ Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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]. Other people may also be treated with antiviral drugs by their doctor this season. Most healthy people with flu, however, do not need to be treated with antiviral drugs.
What are the benefits of antiviral drugs?When used for treatment, these drugs can make you feel better and shorten the time you are sick by 1 or 2 days. They can also prevent serious flu complications.
When should antiviral drugs be taken for treatment?Studies have shown that flu antiviral drugs work best for treatment if they are started within 2 days of getting sick. There may still be benefit in treating people with antiviral drugs even after two days have gone by, especially if the sick person has a greater chance of serious flu complications (see box) [ Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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] or if the person has certain symptoms (such as shortness of breath, chest pain/pressure, dizziness, or confusion) or is in the hospital because of the flu.
How long should antiviral drugs be taken?To treat flu, Tamiflu® and Relenza® are usually taken for 5 days, although people hospitalized with flu may need the medicine for longer than 5 days.
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