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Calcium carbonateOver the counter
Pronounced KAL-see-um KAR-bon-ate
Brand names: Tums
Type: Antacid and calcium supplement · All Digestive (GI) Medicines
What Calcium carbonate is used for
- Heartburn and acid indigestion
- Calcium supplementation
- Binding phosphate in chronic kidney disease (on specialist advice)
◆ Kidney note
A classic phosphate binder in kidney disease, but total calcium intake is monitored because excess calcium can deposit in blood vessels.
Common side effects
- Constipation
- Gas and bloating
- Chalky taste
Important cautions
- Taking large amounts for long periods can raise blood calcium too much
- It blocks absorption of several medicines, including thyroid hormone and some antibiotics — separate the timing
How it comes
Chewable tablets, tablets, liquid. This guide lists forms only — it never lists strengths or doses.
Related medicines — Digestive (GI) Medicines
Condition guides on MedicalVideos.com
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.