title: Letter: Effect of phenytoin on serum phenobarbitone levels.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D004827:Epilepsy / Q000188:drug therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010634:Phenobarbital / Q000097:blood* / Q000627:therapeutic use; D010672:Phenytoin / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D010672:Phenytoin; D010634:Phenobarbital