Thiazides & other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, OC, phenytoin, nicotinic acid, sympathomimetics, Ca-channel-blocking drugs, INH, sulfonylureas or insulin, intestinal adsorbents (eg, charcoal) & digestive enzyme prep containing carbohydrate-splitting enzymes (eg, amylase, pancreatin).