SEARCH Articles Figures Tables Drug metabolism genetic polymorphism Drug metabolism polymorphisms Drug-metabolizing enzymes polymorphisms Genetic polymorphisms drug-metabolizing enzymes Genetic polymorphisms in drug metabolism Genetic polymorphisms in drug-metabolizing enzymes Mephenytoin, polymorphic metabolism Metabolism and genetic polymorphisms Oxidative polymorphism, poor extensive metabolizers Phenytoin, polymorphic metabolism Polymorphic drug metabolizing enzymes Polymorphic metabolic enzymes