Amantadine is an antiviral medication. It blocks the actions of viruses in your body. Amantadine is used to treat and to prevent influenza A (a viral infection). There may be some flu seasons during which amantadine is not recommended because certain flu strains may be resistant to this drug. Amantadine is also used to treat Parkinson's disease and "Parkinson-like" symptoms such as stiffness and shaking that may be caused by the use of certain drugs. Amantadine may also be used for other purposes not listed in this medication guide.
Amantadine is an antiviral and anti Parkinson agent. Its functionality towards the flu is never known. It might block the reproduction of the virus and reduce the capacity of the virus to penetrate the cells. Similarly, how it works counter to Parkinson's disease is also not known but it might increase a particular chemical within the brain.