NCIt definition : The sulfate salt of amantadine, a synthetic tricyclic amine with antiviral, antiparkinsonian,
and antihyperalgesic activities. Amantadine appears to exert its antiviral effect
against the influenza A virus by interfering with the function of the transmembrane
domain of the viral M2 protein, thereby preventing the release of infectious viral
nucleic acids into host cells; furthermore, this agent prevents virus assembly during
virus replication. Amantadine exerts its antiparkinsonian effects by stimulating the
release of dopamine from striatal dopaminergic nerve terminals and inhibiting its
pre-synaptic reuptake. This agent may also exert some anticholinergic effect through
inhibition of N-methyl-D-aspartic acid (NMDA) receptor-mediated stimulation of acetylcholine,
resulting in antihyperalgesia.;