Oseltamivir phosphate is an anti-influenza drug with the trade name Tamiflu. It is white to yellow-white powder in appearance. It can be divided into type A (A) and type B (B) influenza virus neuraminidase selective inhibitors. It can prevent the release and dissemination of virus from infected cells by inhibiting the neuraminidase of virus, thus achieving the purpose of controlling influenza symptoms.

Clinically, it is used for the treatment of influenza A and B in adults and children aged 1 and above, and the prevention of influenza A and B in adults and adolescents aged 13 and above.