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Calcium Carbonate

    DEA Class;OTC

    Common Brand Names; Tums, Tums Chewy Delights, Tums Extra, Tums Freshers, Tums Kids, Tums Regular, Tums Smoothies, Tums Ultra, Children’s Pepto, Calci-Chew, Caltrate 600, Oysco 500

    • Antacids; 
    • Calcium Salts

    Antacid: Neutralizes gastric acidity

    Dietary supplement: Prevents or treats negative Ca balance; oral Ca supplements may protect against renal calculi formation by chelating with oxalate in gut and preventing its absorption

    Phosphate binder: Binds with dietary phosphate to form insoluble calcium phosphate, which is excreted in feces

    Indicated to relieve heartburn, acid indigestion, sour stomach, or upset stomach associated with these symptoms



    Renal calculi



    Suspected digoxin toxicity








    Milk-alkali syndrome

    Shake suspension well; chew tablets thoroughly

    Bloating, gas, and constipation may occur with therapy

    Hypercalcemia may occur from long-term use, which may exacerbate nephrolithiasis or cause generalized soft tissue and vascular calcification; may also increase mortality in patients with chronic kidney disease

    Drug administration impaired by achlorhydria, common in the elderly; consider using an alternate salt form of calcium

    Hypercalciuria and hypercalcemia may occur in patients with hypoparathyroid disease, receiving high doses of vitamin D

    Kidney stones reported with use; exercise caution in patients with history

    Use caution in patients with renal insufficiency; patients more susceptible to effects of excess calcium

    Advise patients to limit intake of oxalate-rich foods (soy; green, leafy vegetables; animal protein) to avoid reduced absorption through Ca-oxalate formation

    Pregnancy category: C

    Lactation: Safe; crosses the placenta; appears in breast milk

    calcium carbonate

    suspension, oral

    • 1250mg (elemental calcium 500mg per 5 mL)


    • 1250mg (elemental calcium 500 mg) (Oysco, generic)
    • 1500mg (elemental calcium 600 mg) (Caltrate)

    tablet, chewable

    • 400mg (Pepto Kids)
    • 500mg (Tums Regular, Tums Freshers)
    • 750mg (Tums Chewy Bites, Tums Extra, Tums Kids, Tums Smoothies)
    • 1000mg (Tums Ultra)
    • 1177mg (Tums Chewy Delights)