Iodinated contrast media, alcohol, cationic drugs that are eliminated by renal tubular secretion, furosemide, nifedipine. Decreases vit B12
absorption. Thiazide & other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, OC, phenytoin, nicotinic acid, sympathomimetics, Ca-channel blockers & INH may produce hyperglycemia & lead to loss of glycemic control. The hypoglycemic action of sulfonylureas may be potentiated by NSAIDs & other highly protein-bound drugs, salicylates, sulfonamides, chloramphenicol, probenecid, coumarins, MAOIs, β-blockers, ciprofloxacin, oral miconazole & other oral hypoglycemic agents.