title: A controlled study comparing trihexyphenidyl hydrochloride plus levodopa with placebo plus levodopa in patients with Parkinson's disease.
mesh_terms: D000342:Affective Symptoms / Q000139:chemically induced; D000368:Aged; D001007:Anxiety; D002986:Clinical Trials as Topic; D003221:Confusion / Q000139:chemically induced; D004341:Drug Evaluation; D004359:Drug Therapy, Combination; D005260:Female; D006212:Hallucinations / Q000139:chemically induced; D006801:Humans; D007024:Hypotension, Orthostatic / Q000139:chemically induced; D007980:Levodopa / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009325:Nausea / Q000139:chemically induced; D010300:Parkinson Disease / Q000188:drug therapy*; D010919:Placebos; D012893:Sleep Wake Disorders / Q000139:chemically induced; D013997:Time Factors; D014282:Trihexyphenidyl / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D014839:Vomiting / Q000139:chemically induced
chemical_list: D010919:Placebos; D007980:Levodopa; D014282:Trihexyphenidyl