Letter: antagonism of levodopa by papaverine.
D000368:Aged; D005260:Female; D006801:Humans; D007980:Levodopa / Q000037:antagonists & inhibitors* / Q000627:therapeutic use; D010208:Papaverine / Q000494:pharmacology*; D010300:Parkinson Disease / Q000188:drug therapy
D007980:Levodopa; D010208:Papaverine