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Can you take Aluminum Hydroxide and Magnesium Hydroxide while pregnant?

Updated Sep 7, 20262 min readAnswer
On this pageShort answer Taking Aluminum Hydroxide and Magnesium Hydroxide while pregnant: what to do Common questions Related questions Sources
Short answer

Yes, combination antacids with aluminum hydroxide and magnesium hydroxide are generally considered acceptable during pregnancy when used at label doses for short-term heartburn relief.

These antacids work in the stomach and very little is absorbed into your bloodstream, which is why clinicians often suggest them for pregnancy heartburn. The answer changes if you have kidney disease, since your body clears magnesium and aluminum less well, or if you find yourself needing a dose most days. Timing matters more than most people expect: antacids block the absorption of iron, prenatal vitamins, thyroid medicine, and some antibiotics, so take them at least two hours apart. Smaller meals, staying upright for an hour after eating, and raising the head of your bed often cut how much antacid you need. Bring the product label to your prenatal visit so your clinician can check the exact ingredients and any sodium content.

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Taking Aluminum Hydroxide and Magnesium Hydroxide while pregnant: what to do

1Read the full ingredient list:Many combination products also contain simethicone or sodium, so check the label before you buy.
2Separate from your prenatal vitamin:Leave at least two hours between the antacid and any iron, thyroid, or antibiotic dose.
3Stick to the label dose:Use the smallest amount that settles your symptoms instead of dosing on a fixed schedule all day.
4Adjust meals first:Smaller, more frequent meals and staying upright for an hour after eating reduce how often you need a dose.
5Flag kidney problems:Tell your clinician if you have reduced kidney function, since magnesium and aluminum build up more easily.
6Know when to call:Daily heartburn, vomiting, trouble swallowing, or upper belly pain needs a clinician rather than more antacid.

Common questions

Can you take Aluminum Hydroxide and Magnesium Hydroxide while pregnant?

Antacids combining aluminum hydroxide and magnesium hydroxide are commonly used for heartburn in pregnancy and are generally considered acceptable at label doses. Use the lowest dose that controls your symptoms, and treat it as short-term relief rather than a daily routine. Space it at least two hours apart from iron, prenatal vitamins, thyroid medicine, and antibiotics, because it blocks their absorption. Magnesium can loosen stools and aluminum can cause constipation, so the combination balances out for many people. Check with your clinician if you have kidney disease, if you need a dose most days, or if heartburn comes with vomiting, trouble swallowing, weight loss, or upper belly pain.

About this page. Written and maintained by the Pymander Health team. Last updated September 7, 2026.

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