Antihyperglycemic, salicylates & pyrazolones, MAOIs, oxytetracycline, ACE inhibitors, derivatives of clofibrate, cyclophosphamide & insulin. β-blockers, clonidine, reserpine & guanethidine. Glucocorticoids, OCs, adrenaline & other sympathomimetics, glucagons, thyroid hormones & phenothiazines. Cimetidine, alcohol.