May increase the risk of hypoglycemia w/ antidiabetic agents, ACE inhibitors, ARBs, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, pramlintide, propoxyphene, salicylates, somatostatin analogs (eg, octreotide) & sulfonamides. May decrease blood glucose lowering effect w/ atypical antipsychotics (eg, olanzapine & clozapine), corticosteroids, danazol, diuretics, estrogens, glucagon, INH, niacin, OCs, phenothiazines, progestogens (eg, in OCs), PIs, somatropin, sympathomimetic agents (eg, albuterol, epinephrine, terbutaline), & thyroid hormones. May increase or decrease the blood glucose lowering effect w/ alcohol, β-blockers, clonidine, & lithium salts; pentamidine. May blunt signs & symptoms of hypoglycemia w/ β-blockers, clonidine, guanethidine & reserpine.