Treatment of Parkinson's disease with levodopa combined with L-alpha-methyldopahydrazine, an inhibitor of extracerebral DOPA decarboxylase.

Thirty patients with Parkinson's disease were treated for four weeks with levodopa combined with an inhibitor of extracerebral dopa decarboxylase, L-alpha-methyldopahydrazine (MK 486). The therapeutic results were compared with the effects of treatment of a group of 40 patients with levodopa alone. Patients treated with the combined therapy improved more rapidly, had less nausea and vomiting, and required a much smaller dose of levodopa than patients treated with levodopa by itself.