title: Treatment with tryptophan of levodopa-associated psychiatric disturbances.
abstract: The effect of 2 to 6 g of tryptophan per day on levodopa-induced psychiatric symptoms was tested in nine patients with Parkinson's disease in a double-blind, placebo-controlled trial. The psychiatric disturbances were not greatly altered by administration of tryptophan.
mesh_terms: D000368:Aged; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007980:Levodopa / Q000009:adverse effects* / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000188:drug therapy; D011569:Psychiatric Status Rating Scales; D011605:Psychoses, Substance-Induced / Q000188:drug therapy*; D014364:Tryptophan / Q000627:therapeutic use*
chemical_list: D007980:Levodopa; D014364:Tryptophan