RT Journal A1 Strayhorn VA, Baciewicz AM, Self TH T1 UPdate on rifampin drug interactions, iii JF Archives of Internal Medicine JO Archives of Internal Medicine YR 1997 FD November 24 VO 157 IS 21 SP 2453 OP 2458 DO 10.1001/archinte.1997.00440420085007 UL http://dx.doi.org/10.1001/archinte.1997.00440420085007 AB Rifampin is a potent inducer of cytochrome P-450 oxidative enzymes. Examples of well-documented, clinically significant interactions include warfarin, oral contraceptives, cyclosporine, glucocorticoids, ketoconazole, theophylline, quinidine, digitoxin, and verapamil. Recent reports have demonstrated clinically relevant interactions with protease inhibitors, zidovudine, delavirdine, itraconazole, nifedipine, midazolam or triazolam, nortriptyline, and doxycycline. To avoid reduced therapeutic response, therapeutic failure, or toxic reactions when rifampin is added to or discontinued from medication regimens, clinicians need to be cognizant of these interactions. Enhanced knowledge of known interactions will continue to develop, including research on induction of specific cytochrome P-450 isoenzymes. New rifampin interactions will be discovered with further investigations.Arch Intern Med. 1997;157:2453-2458