Ans. b. Phenytoin (Ref Goodman Gillman Ilth/1302; Katzung II/e plI44)Ritonavir inhibits metabolism of Amiodarone, Cisaprlde, Midazolam and but not the phenytoin'The majority (95%o) of phenytoin is metabolized principalty in the hepatic endoplasmic reticulum by CYP2C9/10 and to a lesser extent CYP2C9.'
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