Increased effect w/ acetaminophen, androgens, capecitabine, cephalosporins, disulfiram, fibric acids, glucagon, NSAIDs, COX-2 selective, propoxyphene, quinolones, SSRIs, sulfonamides, thyroid hormones, zafirlukast, zileuton, allopurinol, amiodarone, antifungals, cimetidine, HMG-CoA reductase inhibitors, metronidazole, omeprazole, propafenone, quinidine, macrolides, tetracyclines, vit E. Decreased effect w/ OC, estrogens, griseofulvin, aminoglutethimide, barbiturates, carbamazepine, glutethimide.