<prompt> All of the following are enzyme inducers of cytochrome p450 EXCEPTPhenytoinRifampicinIsoniaz idErythromycin  <response>: D Erythromycin Enzyme inducers: Phenytoin, phenobarbitone, primidone, carbamazepine, rifampin. Erythromycin is a CYP3A2 inhibitor.Mnemonic: GPRS Cell Phone - Griseofulvin, Phenytoin, Pifampcin, Smoking, Carbamazepine, Phenobarbitone 