Is calcium carbonate the same as Tums?
Tums is a brand name for chewable antacid tablets whose active ingredient is calcium carbonate. They contain the same compound—calcium carbonate (CaCO3)—used to neutralize stomach acid and relieve heartburn, indigestion, and upset stomach.[1]
What does Tums actually contain?
Each Tums tablet typically has 500–750 mg of calcium carbonate per tablet, depending on strength (regular, extra strength, or ultra). Inactive ingredients include sugar, corn syrup, flavorings, and binders like adipic acid. Generic versions use identical formulations.[1][2]
Are generic calcium carbonate tablets the same as Tums?
Yes, store-brand calcium carbonate chewables (e.g., from Walmart or CVS) match Tums in active ingredient, dosage, and effect. Differences are minor: flavor variety, texture, or price. Tums often costs more due to branding.[2]
How does calcium carbonate in Tums work?
It reacts with stomach hydrochloric acid to form calcium chloride, water, and carbon dioxide, raising pH quickly (within minutes). Effects last 1–3 hours. It's also a calcium supplement, providing 20–30% daily value per dose.[1]
Can you use plain calcium carbonate powder instead of Tums?
Powdered calcium carbonate (pharmaceutical grade) works the same for acid relief but lacks chewable convenience, flavor, and precise dosing. Mix 500–1000 mg in water; avoid food-grade versions meant for animals or industry.3
What are common side effects or risks?
Constipation from high calcium intake is frequent; gas or belching from CO2 release. Overuse risks milk-alkali syndrome (hypercalcemia, kidney issues). Limit to 7 doses/day; consult doctor if pregnant or on medications like antibiotics.[1][2]
Tums vs. other antacids: Key differences
| Antacid | Active Ingredient | Speed | Duration | Notes |
|--------|-------------------|--------|----------|-------|
| Tums | Calcium carbonate | Fast | 1–3 hrs | Calcium source; avoid long-term |
| Maalox/Pepto | Aluminum/magnesium hydroxide | Fast | 1–2 hrs | Less calcium; diarrhea risk |
| Rolaids | Calcium carbonate + magnesium | Fast | 1–3 hrs | Balances constipation/diarrhea |
| Gaviscon | Alginic acid + antacids | Medium | 2–4 hrs | Forms raft over stomach |
Tums provides more calcium than magnesium-based options.[1][2]
When to avoid Tums or calcium carbonate?
Skip if you have kidney stones, hypercalcemia, or take digoxin/thyroid meds (interactions). Not for kids under 12 without advice. For chronic issues, see a doctor—could signal GERD or ulcers.[1]
[1]: https://www.tums.com/
[2]: https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/calcium-carbonate