Pioglitazone: Increased exposure & t½ w/ strong CYP2C8 inhibitors (eg, gemfibrozil). Decreased exposure w/ CYP2C8 inducers (eg, rifampin); topiramate. Glimepiride: Increased glucose-lowering effect w/ oral anti-diabetic medications, pramlintide acetate, insulin, ACE inhibitors, H
2 receptor antagonists, fibrates, propoxyphene, pentoxifylline, somatostatin analogs, anabolic steroids & androgens, cyclophosphamide, phenyramidol, guanethidine, fluconazole, sulfinpyrazone, tetracyclines, clarithromycin, disopyramide, quinolones, & highly protein-bound drugs, eg, fluoxetine, NSAIDs, salicylates, sulfonamides, chloramphenicol, coumarins, probenecid & MAOIs. Decreased glucose-lowering effect w/ danazol, glucagon, somatropin, PIs, atypical antipsychotic medications (eg, olanzapine & clozapine), barbiturates, diazoxide, laxatives, rifampin, thiazides & other diuretics, corticosteroids, phenothiazines, thyroid hormones, estrogens, OCs, phenytoin, nicotinic acid, sympathomimetics (eg, epinephrine, albuterol, terbutaline), & INH. May potentiate or weaken effect w/ β-blockers, clonidine, & reserpine; acute & chronic alcohol intake. Signs of hypoglycemia may be reduced w/ sympatholytic drugs eg, β-blockers, clonidine, guanethidine & reserpine. Potential interaction leading to severe hypoglycemia w/ miconazole. Inhibited metabolism w/ CYP2C9 inhibitor & inducers. Concomitant use w/ colesevelam may reduce max plasma conc & total exposure.