Anti-viral drug effective against influenza A and B viruses that inhibits the neuraminidase protein, effectively trapping the influenza virus within the host cell and preventing it from infecting new cells. This can help in preventing infection (prophylaxis) or in reducing the duration and severity of illness once infected. It is effective if treatment is started within 48 hours of symptom onset. In Canada and the USA, oseltamivir is sold under the brand name Tamiflu.!-- google_ad_client = "pub-6700624969687881"; google_ad_width = 234; google_ad_height = 60; google_ad_format = "234x60_as"; google_ad_type = "text"; google_ad_channel ="7512561969"; google_color_border = "FFFFFF"; google_color_bg = "FFFFFF"; google_color_link = "448079"; google_color_url = "448079"; google_color_text = "414141";

Oseltamivir (INN) (IPA: ) is an antiviral drug that is used in the treatment and prophylaxis of both Influenzavirus A and Influenzavirus B. Like zanamivir, oseltamivir is a neuraminidase inhibitor. It acts as a transition-state analogue inhibitor of influenza neuraminidase, preventing new viruses from emerging from infected cells.