Can you take Aluminum Hydroxide and Magnesium Hydroxide while pregnant?
Last updated September 7, 2026.
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.
What to do
- Read the full ingredient list: Many combination products also contain simethicone or sodium, so check the label before you buy.
- Separate from your prenatal vitamin: Leave at least two hours between the antacid and any iron, thyroid, or antibiotic dose.
- Stick to the label dose: Use the smallest amount that settles your symptoms instead of dosing on a fixed schedule all day.
- Adjust meals first: Smaller, more frequent meals and staying upright for an hour after eating reduce how often you need a dose.
- Flag kidney problems: Tell your clinician if you have reduced kidney function, since magnesium and aluminum build up more easily.
- Know when to call: Daily heartburn, vomiting, trouble swallowing, or upper belly pain needs a clinician rather than more antacid.
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