Minor side effects are usually relieved by reducing the dose or frequency. For major side effects, contact the physician immediately. Aluminum hydroxide may lead to constipation and, uncommonly, blockage of the bowel. Excessive or long-term use of aluminum containing antacids can lead to subtle poisoning, mental changes and weak bones. They should not be used by patients with chronic kidney failure or on dialysis without discussion with the physician.
Calcium carbonate is a good antacid and provides calcium, which is desirable.
Adults need 1500 mg a day and post menopausal females even more. Unless you drink a quart of milk a day, you likely do not get enough calcium from your food. However, do not use this product just for calcium as there may be too much, even toxic, amounts of aluminum and magnesium. Magnesium hydroxide can cause diarrhea and, in patients with kidney failure or on dialysis, lead to a high toxic magnesium blood level. This should be discussed with the physician.