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Pharmacology General 0a1b9d20

Which of the following about phenytoin is true ?

A
It follows zero order kinetics
B
Not an hepatic enzyme inducer
C
It is excreted unchanged in urine
D
It is not teratogenic
High-Yield Explanation
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.

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