Parkinson's disease.
D000368:Aged; D004334:Drug Administration Schedule; D004359:Drug Therapy, Combination; D006801:Humans; D007980:Levodopa / Q000008:administration & dosage / Q000627:therapeutic use; D008297:Male; D010300:Parkinson Disease / Q000188:drug therapy*; D014282:Trihexyphenidyl / Q000627:therapeutic use
D007980:Levodopa; D014282:Trihexyphenidyl