How do you take Aluminium hydroxide; Magnesium hydroxide; Simeticone?

For adults, take 1 to 2 chewable tablets or 10 to 20 ml of suspension, usually 20 to 60 minutes after meals and at bedtime, or whenever you feel heartburn or stomach discomfort. Chew the tablets well before swallowing; do not swallow them whole. Shake the suspension bottle well before each use. You can take it up to 4 times a day, but do not exceed the dose on the pack.

What are the side effects of Aluminium hydroxide; Magnesium hydroxide; Simeticone?

Loose stools or mild diarrhoea (from the magnesium), constipation (from the aluminium), chalky or unusual taste in the mouth, mild stomach cramps, whitish-coloured stool

Who should not take Aluminium hydroxide; Magnesium hydroxide; Simeticone?

People with severe kidney problems should avoid this medicine. Do not take it if you are allergic to any of the ingredients. People with very low phosphate levels or those on dialysis should also avoid it. Children under 6 years should not take it without a doctor's advice.

OTC

Antacid with anti-flatulent

Aluminium hydroxide; Magnesium hydroxide; Simeticone

Q: What is Aluminium hydroxide; Magnesium hydroxide; Simeticone used for?

Heartburn, stomach ulcer pain, acid indigestion, stomach gas and bloating, belching, feeling of fullness after eating

Last reviewed July 2026

Who is this for?

For adults (18+). Standard adult dosing applies: see the How to Take tab for full instructions.

What is this drug?

This is a combination antacid and anti-gas medicine. Aluminium hydroxide and magnesium hydroxide work together to neutralize excess stomach acid, while simeticone helps break up gas bubbles in your stomach and intestines so you feel less bloated.

How it works

Neutralises gastric acid through direct chemical reaction with hydrochloric acid, whilst simeticone reduces surface tension of gas bubbles to facilitate coalescence and expulsion of intestinal gas, thereby relieving abdominal distension and discomfort.

What is it used for?

Heartburnstomach ulcer painacid indigestionstomach gas and bloatingbelchingfeeling of fullness after eating

Browse by condition

Ulcer & Stomach Acid Tuberculosis (TB)Muscle Cramps & Spasms Bloating & Gas

Available Over The Counter

Get this from any pharmacy or chemist: no prescription needed.

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What to watch out for

Buy only trusted brands like Dexanta, Gasmag, Gastacid, Avrocid, Digicid, or Ebecid from a registered pharmacy. Avoid buying antacids from roadside sellers or open markets as they may be expired or fake. Do not use this medicine continuously for more than 2 weeks without seeing a doctor, as ongoing stomach pain could be a sign of something more serious. If you are taking other medicines, always space them out from this antacid by at least 2 hours.

Common Side Effects

Loose stools or mild diarrhoea (from the magnesium)
constipation (from the aluminium)
chalky or unusual taste in the mouth
mild stomach cramps
whitish-coloured stool

Serious Side Effects

Severe or persistent diarrhoea or constipation that does not stop
signs of allergic reaction such as rash
swelling of the face or difficulty breathing
muscle weakness or confusion: if you notice any of these
stop the medicine and see a doctor immediately.

Drug Interactions

This antacid can reduce the effectiveness of many other medicines if taken at the same time, especially antibiotics like ciprofloxacin and tetracycline, so take them at least 2 hours apart. It can also reduce the absorption of iron supplements and malaria drugs. Avoid taking it at the same time as any other oral medication; leave a gap of at least 1 to 2 hours.

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Pregnancy & Breastfeeding Warning

Occasional use during pregnancy and breastfeeding is generally considered safe, but do not use it regularly or in high doses without consulting your doctor or midwife first.

Who Should NOT Take This

People with severe kidney problems should avoid this medicine. Do not take it if you are allergic to any of the ingredients. People with very low phosphate levels or those on dialysis should also avoid it. Children under 6 years should not take it without a doctor's advice.

How to Store

Store in a cool, dry place away from direct sunlight and heat. Nigerian weather can be very hot, so avoid leaving it in your car or near a window. Do not freeze the suspension. Always keep the bottle tightly closed and store out of reach of children.

For information only: not medical advice. Always talk to a doctor or pharmacist before changing your medication.