How do you take Magnesium trisilicate; Dried Aluminium hydroxide?

For tablets: Chew 1 to 2 tablets when you feel heartburn or stomach discomfort, usually between meals and at bedtime. For the suspension (liquid): Take 1 to 2 teaspoonfuls (5-10 ml) three to four times daily between meals and at bedtime. Shake the liquid well before use. You can take it with water if needed.

What are the side effects of Magnesium trisilicate; Dried Aluminium hydroxide?

Constipation (difficulty passing stool, more common from the aluminium component), loose stool or mild diarrhoea (more common from the magnesium component), feeling of fullness or bloating, chalky taste in the mouth

Who should not take Magnesium trisilicate; Dried Aluminium hydroxide?

People with severe kidney problems should avoid this medicine. Do not use if you are allergic to magnesium trisilicate or aluminium hydroxide. People on a low-phosphate diet or those with very low phosphate levels should also avoid it. Patients with intestinal blockage should not take it.

OTC

Antacid

Magnesium trisilicate; Dried Aluminium hydroxide

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 an antacid medicine that combines magnesium trisilicate and dried aluminium hydroxide, two ingredients that work together to neutralize excess stomach acid and provide a protective coating on the stomach lining, giving you relief from heartburn and stomach discomfort.

How it works

Neutralizes gastric acid by binding hydrogen ions through chemical reaction, while magnesium trisilicate forms a protective colloidal layer on the gastric mucosa; aluminum hydroxide additionally inhibits pepsin activity, reducing both acidity and mucosal irritation.

What is it used for?

Heartburn, stomach ulcer, indigestion (the burning feeling in your chest after eating), excess stomach acid, sour stomach, acid reflux (when acid comes back up your throat)

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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 from registered pharmacies, avoiding antacids from roadside sellers or open markets as they may be expired or fake. Do not use this antacid continuously for more than 2 weeks without seeing a doctor, as persistent stomach pain could be something more serious. If you are taking other medicines, space them at least 2 hours apart from this antacid so it does not block their effect.

Common Side Effects

Constipation (difficulty passing stool, more common from the aluminium component)
loose stool or mild diarrhoea (more common from the magnesium component)
feeling of fullness or bloating
chalky taste in the mouth

Serious Side Effects

Severe constipation or stomach pain that does not go away: see a doctor immediately. Signs of kidney problems such as swelling of feet
reduced urination
or unusual tiredness
especially if you use it for a long time. Allergic reaction like rash
swelling of the face or difficulty breathing: go to the hospital right away.

Drug Interactions

This antacid can reduce how well other medicines work if taken at the same time, especially tetracycline antibiotics, iron supplements (like ferrous sulphate for blood tonic), and ciprofloxacin. Take those other medicines at least 2 hours before or after taking this antacid. It can also affect the absorption of some malaria and TB drugs, so tell your pharmacist about any other medicines you are taking.

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Pregnancy & Breastfeeding Warning

Occasional use may be okay during pregnancy and breastfeeding, but do not use it regularly or in large amounts without consulting your doctor or pharmacist first.

Who Should NOT Take This

People with severe kidney problems should avoid this medicine. Do not use if you are allergic to magnesium trisilicate or aluminium hydroxide. People on a low-phosphate diet or those with very low phosphate levels should also avoid it. Patients with intestinal blockage should not take it.

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. Keep the bottle tightly closed. Always keep it out of reach of children.

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