title: Drugs that reduce efficacy of levodopa.
mesh_terms: D006801:Humans; D007980:Levodopa / Q000037:antagonists & inhibitors*; D010300:Parkinson Disease / Q000188:drug therapy; D011618:Psychotic Disorders / Q000188:drug therapy; D014149:Tranquilizing Agents / Q000494:pharmacology*
chemical_list: D014149:Tranquilizing Agents; D007980:Levodopa