Flu Medications Tamiflu Tamfilu (Tam-ih-flew) is indicated for the treatment of influenza who have had symptoms for no more than 2 days. Tamiflu belongs to a group of medicines called neuraminidase inhibitors. These medications attack the influenza virus and prevent it from spreading inside your body. Tamiflu treats flu at its source by attacking the virus that causes the flu, rather than simply masking symptoms. Flumadine Flumadine (rimantadine hydrochloride) is a synthetic antiviral drug available as a 100 mg film-coated tablet. Flumadine is indicated for the prophylaxis and treatment of illness caused by various strains of influenza A virus in adults.