title: A double-blind study of the effects of levodopa in Parkinson's disease.
mesh_terms: D000368:Aged; D002986:Clinical Trials as Topic; D004295:Dihydroxyphenylalanine / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009048:Motor Skills / Q000187:drug effects; D010300:Parkinson Disease / Q000188:drug therapy*; D011352:Procyclidine / Q000008:administration & dosage / Q000009:adverse effects
chemical_list: D004295:Dihydroxyphenylalanine; D011352:Procyclidine