. "Your doctor may need to change the doses of your medications or monitor you carefully for side effects.if you are taking vitamin and mineral supplements such as iron, or if you are taking antacids containing calcium, magnesium, or aluminum (Maalox, Mylanta, Tums, others), take them 2 hours before or 2 hours after you take etidronate.tell your doctor if you have or have ever had problems with your" . . . .