Oseltamivir (INN) is an antiviral drug that slows the spread of influenza (flu) virus between cells in the body by stopping the virus from chemically cutting ties with its host cell—median time to symptom alleviation is reduced by 0.5–1 days. The drug is sold under the trade name Tamiflu and is taken orally in capsules or as a suspension. It has been used to treat and prevent Influenzavirus A and Influenzavirus B infection in over 50 million people since 1999. Oseltamivir becomes active in the body once it passes through the liver.
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