<prompt> Which of the following about phenytoin is true ?It follows zero order kineticsNot an hepatic enzyme inducerIt is excreted unchanged in urineIt is not teratogenic  <response>: Ans. is a i.e., It follows zero order kinetics Phenytoin is metabolized in liver by hydroxylation and glucuranide conjugation option c is incorrect o This drug follows saturation kinetics kinetics changes from first order to zero order within therapeutic concentrations Phenytoin is an enzyme inducer and induces the metabolism of many drugs. Phenytoin is a known teratogenic and produces fetal hydantoin syndrome. 