Increased risk of phosphate depletion syndrome w/ hypercalciuria & osteomalacia or Al ion-induced deterioration in dementia syndrome in patients receiving chronic renal dialysis. Caution in individuals w/ severe constipation, especially elderly or following low-Na diet. Antacids should not be administered in combination w/ tetracyclines, anticholinergics, cimetidine, INH, triazole antifungal Fe salts, carbenoxolone, digitoxin, quinidine, phenobarb, warfarin, phenindione, captopril, corticosteroids, fluoroquinolones, H
2 histamine receptor antagonists, hydantoins, ketoconazole, penicillamine, phenothiazines, salicylates, ticlopidine, levodopa, sulfonylureas, Na valproate & Na polystyrene sulfonate. Pregnancy & lactation.