Magnesium Hydroxide: Uses, Side Effects, and What You Need to Know

When you reach for an over-the-counter remedy for heartburn or constipation, you might be holding magnesium hydroxide, a mild base used to neutralize stomach acid and draw water into the intestines. Also known as milk of magnesia, it’s one of the oldest and most straightforward remedies in the medicine cabinet. Unlike stronger antacids that shut down acid production entirely, magnesium hydroxide works by balancing pH—quickly easing discomfort without overdoing it. It’s not just for occasional heartburn; it’s also a go-to for short-term constipation relief because it pulls water into the colon, softening stool and triggering natural movement.

This compound doesn’t just sit on the shelf—it connects to bigger health patterns. People managing acid reflux, irritable bowel syndrome, or even those on long-term medications that cause constipation often turn to it. It’s frequently paired with aluminum hydroxide in combination antacids to balance effects: magnesium loosens, aluminum tightens. But it’s not a one-size-fits-all solution. If you have kidney problems, too much magnesium can build up in your system, leading to muscle weakness or irregular heartbeat. And while it’s safe for most adults, kids and pregnant women should check with a doctor first. It’s also worth noting that regular use as a laxative can mask underlying issues like bowel obstruction or thyroid disorders, which is why it’s meant for occasional use, not daily reliance.

What you’ll find in the articles below isn’t just a list of random posts—it’s a collection focused on real-world medication use, side effects, and alternatives. You’ll see how magnesium hydroxide fits into broader discussions about digestive health, drug interactions, and when to choose a different path. Whether you’re comparing it to other laxatives like polyethylene glycol, wondering if it interferes with your other meds, or just trying to understand why your doctor suggested it, the posts here give you clear, no-fluff answers. No marketing. No hype. Just what you need to know to use it safely and effectively.