Amantadine (1-aminoadamantane, sold as Symmetrel®) is an antiviral drug that was approved by the Food and Drug Administration in 1976 for the treatment of Influenzavirus A in adults. The drug has also been demonstrated to help reduce symptoms of Parkinson's disease and drug-induced extrapyramidal syndromes. As an antiparkinsonic it can be used as monotherapy; or together with L-DOPA to treat L-DOPA-related motor fluctuations (i.e., shortening of L-DOPA duration of clinical effect, probably related to progressive neuronal loss) and L-DOPA-related dyskinesias (choreiform movements associated with long-term L-DOPA use, probably related to chronic pulsatile stimulation of dopamine receptors). Amantadine has been shown to relieve SSRI-induced anorgasmia in some people, though not in all people.
It is a derivate of adamantane, like a similar drug rimantadine.

MedlinePlus: Amantadine - Features information about dosage, usage, warnings, and side effects.
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