<prompt> CYP 450 inducers areCimetidineKetokonazolePhenobarbitoneTheoplylline  <response>: P-450 inducers are: Phenobarbitone, rifampicin, phenytoin, chloe hydrate, phenylbutazone, griseofulvin, DDT, an chronic alcohol ingestion. Ketoconazole and cimetidine inhibit the drug metabolizing enzymes. Ref-KDT 7e p26 