Antacid	Potential adverse effects
Aluminum salts	Constipation
	Accumulation in patients with renal impairment
	Hypophosphatemia
	Osteomalacia (rare)
Calcium salts	Constipation
	Milk-alkali syndrome with high doses
	Rebound hyperacidity (depends on dosage)
Magnesium salts	Diarrhea
	Accumulation in patients with renal impairment
Sodium bicarbonate*	Milk-alkali syndrome with high doses
Magnesium-aluminum combinations	Minor changes in bowel function