NSAIDs, salicylates, sulfonamides, chloramphenicol, coumarins, probenecid, MAOIs, β-blockers, thiazides, diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, OCs, phenytoin, nicotinic acid, sympathomimetics, INH, rifampicin, fluconazole, amiodarone, tolbutamide, diclofenac, ibuprofen, naproxen, H
2-receptor antagonists, clonidine, reserpine, guanethidine. Alcohol.