Final answer:
Amantadine (Symmetrel) is primarily used in the treatment of influenza A. It works by blocking the escape of the influenza virus and preventing viral replication. It is also used for the treatment of Parkinson's disease.
Step-by-step explanation:
Amantadine (Symmetrel) is a synthetic antiviral drug that is primarily used in the treatment of influenza A. It works by binding to a transmembrane protein involved in the escape of the influenza virus from endosomes. By blocking the escape of the virus, amantadine prevents the release of viral RNA into host cells and subsequent viral replication. However, the use of amantadine and its relative rimantadine has been limited due to increasing resistance and the potential for neurological side effects. In addition to its antiviral properties, amantadine is also used for the treatment of Parkinson's disease. It affects brain chemicals such as dopamine and NMDA, making the symptoms of the disease more manageable. Therefore, the main uses of amantadine (Symmetrel) are the treatment of influenza A and Parkinson's disease.