Indication for the treatment of the signs and symptoms of idiopathic parkinsons disease as initial monotherapy and as adjunct therapy to levodopa.mechanism of action the precise mechanisms of action of rasagiline is unknown. one mechanism is believed to be related to its mao-b inhibitory activity, which causes an increase in extracellular levels of dopamine in the striatum. the elevated dopamine level and subsequent increased dopaminergic activity are likely to mediate rasagiline s beneficial effects seen in models of dopaminergic motor dysfunction.