title: Letter: Oxprenolol and levodopa in parkinsonian patients.
mesh_terms: D002395:Catecholamines / Q000652:urine; D002986:Clinical Trials as Topic; D004347:Drug Interactions; D006801:Humans; D007980:Levodopa / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D010096:Oxprenolol / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D010300:Parkinson Disease / Q000188:drug therapy* / Q000652:urine
chemical_list: D002395:Catecholamines; D007980:Levodopa; D010096:Oxprenolol