Serotonin, dopamine, and motor effects in Parkinson's disease.

We review recent reports suggesting that use of selective serotonergic agents that either inhibit synaptic reuptake or have specific serotonin receptor affinities may benefit a variety of motor disturbances in Parkinson's disease. The complex, mixed motoric effects of these agents in Parkinson's disease have not allowed for a consistent view on the interrelationship between dopamine and serotonin (5HT) in motor control but may speak to the nature of dysregulated neurotransmission in the disease.