Safe anta acid in pregnancy
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NHS pregnancy heartburn antacids alginate calcium carbonate sodium bicarbonate guidance
For pregnancy heartburn, antacids and alginate reflux medicines are usually safe for short-term use, but choose with a pharmacist or obstetric clinician.
Common options:
- Calcium carbonate antacid, for example Tums-type products
- Alginate-based products, for example Gaviscon-type reflux barriers
- Some magnesium or aluminium-containing antacids
Avoid or check first:
- Sodium bicarbonate / baking soda antacids, especially regular use, because of high sodium and acid-base risks.
- Products containing bismuth subsalicylate or aspirin-like ingredients.
- Taking any antacid within 2 hours of iron or folic-acid supplements, because it can reduce their absorption.
Try smaller meals, avoid lying down for 2-3 hours after eating, and raise the head of the bed. If symptoms are frequent, severe, or not relieved, a clinician can recommend pregnancy-compatible acid-reducing treatment. The NHS pregnancy guidance supports antacids or alginates after lifestyle measures.
Seek urgent care for chest pain with breathlessness, vomiting blood, black stools, trouble swallowing, or persistent severe upper-abdominal pain.
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