Amantadine is mainly used in patients with tremor palsy who cannot tolerate levodopa treatment, and it also has anti-influenza and antiviral infection fever effects. It can also be used for spontaneous depression of consciousness caused by cerebral infarction, and for Parkinson’s disease it is usually 100mg/dose, twice a day. The maximum daily dose is 0.4g. For the prevention and early treatment of metrorrhagia, it is usually 200mg/day for adults and 2-3mg/kg/day for children, and can be taken once in the morning or in two divided doses. It is usually a course of treatment in about 3 days, and the longest is not more than 10 days. Amantadine enters the brain tissue to promote the release of dopamine, which is more effective in relieving tremor and rigidity. The antiviral mechanism seems to be related to preventing the influenza A virus from penetrating into the respiratory epithelium, and stripping the outer membrane of the virus as well as releasing the nucleic acid of the virus into the host cells. It can also have an effect on viruses that have already penetrated into the cells by affecting the initial replication of the virus. It also has an antipyretic effect, for example on a variety of inflammatory diseases, sepsis, and viral pneumonia. When antibiotics are combined, the antipyretic effect is better than when antibiotics are used alone.