Levodopa and depression in parkinsonism.
D003863:Depression / Q000139:chemically induced*; D004295:Dihydroxyphenylalanine / Q000009:adverse effects* / Q000627:therapeutic use; D004357:Drug Synergism; D006801:Humans; D010300:Parkinson Disease / Q000188:drug therapy*; D014364:Tryptophan / Q000627:therapeutic use
D004295:Dihydroxyphenylalanine; D014364:Tryptophan