Aluminium Hydroxide: What It Is and When to Use It

If you’ve ever grabbed an over‑the‑counter stomach aid, chances are it contained aluminium hydroxide. It’s a simple mineral that neutralises stomach acid, giving quick relief from heartburn, indigestion, or a sour stomach. Most people take it as a chewable tablet or liquid, and it works fast because it directly cancels the acid instead of just masking the pain.

How Aluminium Hydroxide Works

When you swallow aluminium hydroxide, it reacts with the hydrochloric acid in your stomach to form aluminium chloride and water. That chemical swap lowers the overall acidity, so the lining of your stomach feels less irritated. Because it’s not absorbed into your bloodstream in any big amount, the drug stays in your gut where it does its job and then gets flushed out.

Common Uses and Dosage Tips

People typically use aluminium hydroxide for short‑term relief of occasional heartburn or to treat acid‑related symptoms after meals. It’s also a component of many combination antacids that pair it with magnesium to balance out constipation (aluminium can cause it) and diarrhea (magnesium can cause that). The usual adult dose is 500 mg to 1 g every 4–6 hours, but you should never exceed the label’s maximum without checking a pharmacist.

To get the best effect, take the dose after food or when symptoms start. Chewable tablets should be fully chewed; swallowing whole can delay the neutralising action. If you’re on a liquid version, shake it well and measure exactly with the provided cup.

While aluminium hydroxide is generally safe, it does have a few caveats. Long‑term use can lead to low phosphate levels because aluminium binds phosphate in the gut. This is why doctors usually only recommend it for a few weeks unless you have a specific condition that requires ongoing acid control.

Side effects are usually mild but worth noting. Some people experience constipation, especially if they’re not also taking a magnesium‑based antacid. Others might notice a chalky taste or a slightly cloudy appearance in the liquid form. If you develop any unusual stomach pain, muscle cramps, or feel unusually tired, stop the medication and talk to a healthcare professional.

Kidney problems can make aluminium buildup risky, so anyone with chronic kidney disease should avoid it or use it only under strict medical supervision. Pregnant or breastfeeding women should also check with their doctor before reaching for an antacid, just to be safe.

In short, aluminium hydroxide is a handy, fast‑acting tool for occasional heartburn. Use it as directed, watch for constipation, and don’t stretch it out for months without checking in with a doctor. When used wisely, it can keep that burning feeling at bay and let you enjoy meals without the after‑effects.