Decreased blood sugar level w/ other antidiabetics, ACE inhibitors, disopyramide, fluoxetine, fibrates, MAOIs, pentoxifylline, propoxyphene, salicylates, sulfonamide antibiotics. Increased blood sugar level w/ corticosteroids (eg, cortisone), danazol, diazoxide, diuretics, glucagon, INH, oestrogens & progestogens, phenothiazine derivatives, somatropin, sympathomimetics (eg, epinephrine, salbutamol, terbutaline), thyroid hormones, PIs, atypical antipsychotics (eg, olanzapine & clozapine). Increased or decreased blood sugar level w/ β-blockers, clonidine, lithium salts; pentamidine; alcohol. Masked symptoms of hypoglycaemia w/ β-blockers or other sympatholytics (eg, clonidine, guanethidine & reserpine).