Heartburn Medicine in Pregnancy: Are Tums and Antacids Safe?

You ate at six and it is now half past ten. You are still sitting bolt upright on the sofa, because lying down makes it worse, and the burn has not shifted an inch.

Pregnancy heartburn is one of the places where you get a fairly straight answer: the remedies most people reach for first are also among the better-understood options in pregnancy. What is worth knowing before you buy anything is which rung of the ladder to start on, and the couple of exceptions that are easy to pick up by accident.

The options, from gentlest to strongest

Start simple: calcium carbonate (Tums) is the usual sensible first option in pregnancy, and the stronger groups below are for when it is not enough.

• Antacids (neutralize acid): calcium carbonate (Tums) is widely considered a sensible first option and is gentle. Avoid sodium bicarbonate (plain baking soda), which is high in salt and can affect fluid balance, and do not lean heavily on magnesium-heavy antacids late in pregnancy.
• H2 blockers (reduce acid): famotidine (Pepcid) is generally considered acceptable in pregnancy when antacids are not enough. Note that ranitidine (old Zantac) was removed from the market for unrelated reasons, so famotidine is the usual choice now.
• Proton pump inhibitors (strongest): medicines like omeprazole are often used for more stubborn reflux in pregnancy, typically with your provider’s guidance.

Which is right depends on how bad your symptoms are and your history, so a quick word with your provider or pharmacist helps you choose well, especially before moving beyond simple antacids.

Simple steps that often help first

• Eat smaller meals more often, and slow down while eating.
• Avoid your triggers (often spicy, fatty, or acidic foods, and large meals late at night).
• Do not lie down right after eating, and try not to eat within a few hours of bed.
• Prop your upper body up a little at night.
• Stay upright and sip water after meals.

Night is usually the worst of it, which is why the propping matters more than it sounds. If reflux is costing you sleep, sleeping position in pregnancy goes further on getting comfortable, and melatonin in pregnancy covers the supplement most people ask about next.

If you have found the thing that finally takes the edge off your heartburn, the food you gave up, the pillow arrangement, the thing that now lives on your nightstand, leave it in the comments. Everyone solves this slightly differently, and whoever reads this next is sitting up in the dark and has run out of ideas.

When to call your provider

Check in if heartburn is severe or not controlled by simple antacids, if you need treatment most days, or if you have trouble swallowing, vomiting, or weight loss. One important note: in the second half of pregnancy, pain high in the abdomen or under the ribs can occasionally be a sign of a blood pressure problem like preeclampsia rather than ordinary heartburn, so if upper abdominal pain is new, severe, or comes with headache, vision changes, or swelling, contact your provider promptly.

Medical Disclaimer: This article is for general educational purposes only and is not medical advice, and it does not replace guidance from your doctor, midwife, or pharmacist. Recommendations depend on your individual history, so always confirm what is safe for you with a qualified professional. If you think you may be experiencing a medical emergency, contact your local emergency services right away.

Sources

• American College of Obstetricians and Gynecologists (ACOG). Guidance on heartburn and reflux in pregnancy.
• MotherToBaby (OTIS). Fact sheets on antacids, famotidine, and omeprazole in pregnancy.
• National Health Service (NHS). “Indigestion and heartburn in pregnancy.” 2024.