Calcium is a mineral that is found naturally in foods. Calcium is necessary for many normal functions of the body, especially bone formation and maintenance. Calcium can also bind to other minerals (such as phosphate) and aid in their removal from the body.

Calcium carbonate is used to prevent and to treat calcium deficiencies.

Calcium carbonate may also be used for purposes not listed in this medication guide.

Do not take calcium carbonate or antacids that contain calcium without first asking your doctor if you also take other medicines. Calcium can make it harder for your body to absorb certain medicines.

Calcium carbonate works best if you take it with food.

To make sure you can safely take calcium carbonate, tell your doctor if you have any of these other conditions:

• a history of kidney stones; or

• a parathyroid gland disorder.

Talk to your doctor before taking calcium carbonate if you are pregnant.

Talk to your doctor before taking calcium carbonate if you are breast-feeding a baby.