CYTOCHROME P450 INHIBITORS - These medications inhibit the action of one of more cytochrome P450 isoenzymes. Examples of drugs which inhibit cytochrome P450 include: cimetidine, ciprofloxacin, diltiazem (may also act as an inducer), enoxacin, erythromycin, amiodarone, co-trimoxazole, disulfiram, fluconazole, felbamate, fluoxetine, haloperidol, paroxetine, clarithromycin, danazol, fluvoxamine, mexiletine, norfloxacin, tacrine (may also act as an inducer), fluvastatin, metronidazole, phenylbutazone, omeprazole (may also act as an inducer), propafenone (may also induce cytochrome P450), quinidine (may also induce cytochrome P450), thioridazine (may also induce cytochrome P450), itraconazole, ketoconazole, miconazole, nefazodone, propoxyphene, and troleandomycin. Grapefruit juice can also act as a cytochrome P450 inhibitor.