<prompt> CYP450 inducers are:CimetidineKetoconazolePhenobarbitoneTheophylline  <response>: - P450 inducers Phenobarbitone Rifampicin Phenytoin Chloral hydrate Griseofulvin Phenylbutazone DDT Chronic alcohol ingestion- Cimetidine and Ketoconazole inhibits metabolizing enzymes. 