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.

  • Alcalak, Alka-Mints, Calci Mix (obsolete), Calci-Mix, Calcium Oyster Shell, Cal-Gest, Caltrate, Icar Prenatal Chewable Calcium, Maalox Quick Dissolve, Maalox Regular Strength, Os-Cal 500, Oysco 500, Oyster Calcium, Oyster Shell Calcium 500, Pepto Children's, Rolaids Soft Chew, Tums
  • Call your doctor at once if you have:

    little or no urinating;
    swelling, rapid weight gain; or
    high levels of calcium in the blood--nausea, vomiting, stomach pain, loss of appetite, constipation, increased thirst or urination, muscle pain or weakness, joint pain, confusion, and feeling tired or restless.
    Common side effects may include:

    nausea or vomiting;
    decreased appetite;
    dry mouth or increased thirst; or
    urinating more than usual.
  • Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Calcium carbonate works best if you take it with food. Swallow the calcium carbonate tablet or capsule with a full glass of water. The chewable tablet should be chewed before you swallow it. Shake the oral suspension (liquid) well just before you measure a dose. Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one. Use the calcium carbonate powder as directed. Allow the powder to dissolve completely, then consume the mixture.
  • Bacterial Infection

    Treating certain bacterial infections. It may be used in combination with other medicines to treat acne or certain amoeba infections. It may be used to prevent certain types of malaria in travelers who will be visiting malaria-infected areas for less than 4 months. It may also be used to prevent or slow the progression of anthrax after exposure. Doryx delayed-release capsules are a tetracycline antibiotic. It works by slowing the growth of bacteria. Slowing the bacteria's growth allows the body's immune system to destroy the bacteria.