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An antacid is a medicine that neutralizes acid already present in the stomach. Antacids are used for occasional heartburn, acid indigestion, and sour stomach. They can give quick symptom relief, but they do not stop the stomach from making acid. Antacids are available over the counter in tablets, chewables, liquids, and dissolving forms.
read more about antacid ...Antacids contain alkaline ingredients that react with stomach acid. This raises the stomach pH and can reduce burning or discomfort from acid irritation. Because they work on acid that is already present, relief can happen faster than with some acid-reducing medicines. The effect can be short-lived, so frequent symptoms need medical review.
Antacids are used for occasional heartburn after meals, acid indigestion, or sour stomach. They can help mild reflux symptoms that happen from time to time. They are not the right treatment for severe chest pain, trouble swallowing, vomiting blood, black stools, or unexplained weight loss. Frequent heartburn can point to GERD or another condition that needs a clinician's evaluation.
Common antacid ingredients include calcium carbonate, magnesium hydroxide, aluminum hydroxide, and sodium bicarbonate. Some products combine magnesium and aluminum to balance diarrhea and constipation effects. Calcium carbonate products can also supply calcium but should not be taken beyond label directions. Sodium bicarbonate products can contain a lot of sodium, which can affect some heart, kidney, or blood pressure conditions.
Antacids can cause constipation, diarrhea, gas, belching, stomach cramps, or changes in mineral balance when overused. They can interfere with absorption of some antibiotics, thyroid medicines, iron, and other drugs. People with kidney disease, heart failure, high blood pressure, or a low-sodium diet should ask a clinician before using some antacids. Seek care for severe belly pain, chest pain, blood in stool, vomiting blood, or symptoms that keep returning.
Antacids can work quickly because they neutralize stomach acid that is already present. Relief timing depends on the product form and symptoms.
No, antacids neutralize existing stomach acid. Acid reducers, such as H2 blockers and proton pump inhibitors, reduce acid production through different mechanisms.
Yes, antacids can reduce or change absorption of some medicines. Ask a pharmacist how far apart to take antacids from prescriptions or supplements.
Daily antacid use should be discussed with a clinician. Frequent heartburn can need a different treatment plan or testing for GERD and related problems.
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Antacids. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK526049/. Date Accessed June 3, 2026.
Antacids. NHS. https://www.nhs.uk/medicines/antacids/. Date Accessed June 3, 2026.
Label: TUMS- calcium carbonate tablet. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=35f79dcf-1743-4d9f-aba5-5ead6b056309. Date Accessed June 3, 2026.