Antacids Safe in Pregnancy: What Works and What to Avoid

When you’re pregnant, heartburn isn’t just annoying—it can feel like a constant fire in your chest. That’s where antacids, over-the-counter medications that neutralize stomach acid to relieve heartburn and indigestion. Also known as acid reducers, they’re one of the first things many pregnant women reach for. But not all antacids are created equal, and some can pose hidden risks to you or your baby. The key isn’t avoiding them altogether—it’s knowing which ones are truly safe and which ones to skip.

Calcium-based antacids like Tums are generally considered safe during pregnancy and even offer a bonus: extra calcium for your growing baby. Magnesium-based options, like Milk of Magnesia, are also fine in moderation, but too much can cause diarrhea or, in rare cases, affect your baby’s muscle tone. You’ll want to avoid antacids with aluminum, especially long-term, because they can build up in your system and interfere with phosphate levels. And never use sodium bicarbonate (baking soda) antacids—they can cause fluid retention and raise your blood pressure, which is dangerous during pregnancy.

What you’re really looking for is a balance: effective relief without side effects. Many doctors recommend starting with lifestyle changes—eating smaller meals, staying upright after eating, and avoiding spicy or fatty foods—before turning to medication. But when those don’t cut it, knowing exactly which antacid to pick makes all the difference. You don’t need to guess. You don’t need to risk it. There’s clear, practical guidance out there.

The posts below give you real, no-fluff details on what’s safe, what’s not, and why. You’ll find comparisons of common brands, warnings about hidden ingredients, and tips on how to use antacids without masking bigger issues. Whether you’re in your first trimester and just starting to feel the burn, or you’re in your third and struggling to sleep because of acid reflux, these guides help you make smarter choices—without the confusion.