Tamiflu (the active ingredient oseltamivir phosphate) works by attacking the flu viruses, preventing them from multiplying in the body and helping to relieve flu symptoms. Tamiflu is indicated for the treatment of influenza in adults and children including term neonates (with influenza virus type A and type B).

Tamiflu (active ingredient oseltamivir phosphate) is an antiviral drug that treats influenza, which works by attacking the flu, preventing it from multiplying in the body and helping to relieve symptoms. Tamiflu, depending on the case, can help prevent flu if people take it before they get sick.