title: Comparison of amantadine, placebo, and levodopa in Parkinson's disease.
mesh_terms: D000368:Aged; D000547:Amantadine / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D004295:Dihydroxyphenylalanine / Q000008:administration & dosage / Q000627:therapeutic use*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009048:Motor Skills; D009127:Muscle Rigidity / Q000188:drug therapy / Q000209:etiology; D010300:Parkinson Disease / Q000150:complications / Q000188:drug therapy*; D010919:Placebos; D014202:Tremor / Q000188:drug therapy / Q000209:etiology
chemical_list: D010919:Placebos; D004295:Dihydroxyphenylalanine; D000547:Amantadine