Overview
Calcium carbonate is an antacid that neutralizes gastric acid to relieve symptoms of acid indigestion, heartburn, and sour stomach. It is available as chewable tablets for rapid symptomatic relief. Patients should not use it for persistent symptoms beyond 2 weeks without medical evaluation.
Mechanism of Action
Calcium carbonate acts as a direct chemical neutralizer of hydrochloric acid in the stomach, raising gastric pH to provide rapid relief from acid-related symptoms.
Indications
- Relief of acid indigestion
- Relief of sour stomach
- Relief of heartburn
- Relief of upset stomach associated with these symptoms
Common Doses
- Chewable tablets (strength not specified in source)
Dosage
Adults and children 12 years and older: Chew 2-3 tablets as symptoms occur, or as directed by a doctor. Do not use for symptoms persisting more than 2 weeks without medical advice.
Contraindications
- Hypersensitivity to calcium carbonate or any component
- Hypercalcemia
- Severe renal impairment
- Calcium-containing kidney stones
Side Effects
- Constipation
- Flatulence
- Nausea
- Hypercalcemia with excessive use
- Acid rebound
Interactions
- Tetracycline antibiotics (reduced absorption)
- Quinolone antibiotics (reduced absorption)
- Iron supplements (reduced absorption)
- Thyroid hormones (reduced absorption)
- Take other medications at least 2 hours apart
Counseling Points
- Chew tablets thoroughly before swallowing
- Do not use for more than 2 weeks continuously without medical advice
- Take other medications at least 2 hours before or after calcium carbonate
- Maintain adequate fluid intake
- Report persistent symptoms to healthcare provider