Antacids can be used indefinitely if they are only taken occasionally. However, when they are necessary several times a day, medical attention is required. Excessive antacid use in the short-term may indicate an underlying disorder that needs different care. The long-term, heavy use of any antacid can produce medical problems and should not be done without a physician's input. The maximum safe dose of calcium carbonate each day is 2000 mg.
Most antacids produce only minor side effects, especially if they are used infrequently.
Minor side effects are usually relieved by reducing the dose or frequency. For major reactions, the patient should contact the physician immediately. Constipation can often be corrected by a high fiber diet. Patients with hormone disorders of the parathyroid glands, those on kidney dialysis or who have any calcium problem should discuss its use with the physician. Antacids are one of mankind's oldest friends.