Trisilicate de magnésium
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 21 oct. 2024
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Magnesium trisilicate relieves the pain and discomfort of indigestion and heartburn.
The recommended adult dose dose is one to two tablets three times a day between meals, and at bedtime.
If you are taking other medicines, do not take magnesium trisilicate within two hours (before or after) of your other medicines.
En un coup d'œil
Magnesium trisilicate is an antacid used for indigestion and heartburn.
It is available as a liquid mixture and as tablets.
Take it when symptoms occur, or when you expect them, up to once an hour.
Do not take it at the same time as other medicines.
Talk to a pharmacist or doctor before taking it if you are pregnant or have other medical conditions.
If symptoms do not improve within a few days, talk to your doctor.
About magnesium trisilicate
Type de médicament | Un antiacide |
Utilisé pour | Indigestion |
Disponible sous forme de | Liquid mixture and tablets |
Antacids are medicines which help to neutralise the acid content of your stomach. They are most commonly used to provide quick relief of symptoms for intermittent bouts of mild indigestion ou brûlures d'estomac. Acid occurs naturally in your stomach. It is produced to help break down and digest the food you eat. Antacids neutralise the acid in your stomach for a short period, so they are best taken when the symptoms occur.
Antacids containing magnesium trisilicate are available as liquid medicine and also in tablet form. Liquid mixtures are considered to be more effective than tablet preparations, although tablets are often more convenient to use. You can buy antacids which contain magnesium trisilicate, without a prescription from pharmacies and other retail outlets.
Before taking magnesium trisilicate
To make sure that this is the right treatment for you, ask a pharmacist or doctor for advice before you start taking magnesium trisilicate if:
You have any of the following symptoms: difficulty swallowing, loss of blood, weight loss, or if you are being sick (vomiting).
You are pregnant. This is because if you are expecting a baby, medicines should only be taken on the advice of a doctor.
You are taking any prescription medicines. This is because antacids can reduce the absorption of many medicines.
You have problems with the way your kidneys work, or problems with the way your liver works.
You have been told by a doctor that you have low levels of phosphate in your blood.
You have ever had an allergic reaction to an antacid medicine.
How to take magnesium trisilicate
Before you start taking the antacid, read the manufacturer's printed information leaflet attached to the pack. It will give you more information about magnesium trisilicate.
The recommended dose for an adult is 10-20 ml (two to four 5 ml spoonfuls) of liquid medicine. The dose for a child aged 5 to 12 years is 5-10 ml (one or two 5 ml spoonfuls). It is usually sufficient to take this dose three times daily between each of your meals and at bedtime, although you can take a dose whenever it is needed up to once an hour. Remember to shake the bottle well before measuring out your dose.
If you are taking tablets, check the label for the directions on how to take them. As a guide, it is usual to chew 1-2 tablets when required.
Antacids are best taken to relieve your symptoms when they occur, or when you are expecting them to occur, such as after eating a large meal. Unless your doctor has told you otherwise, it is not usual to take them regularly every day.
Tirer le meilleur parti de votre traitement
If your symptoms do not improve within a few days, you should talk to your doctor about this.
Some foods may make your symptoms worse. Foods and drinks that have been suspected of this include peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee and alcoholic drinks. If it seems that a food is aggravating your symptoms, try avoiding it for a while to see if your symptoms improve. Also, try avoiding eating large meals, as these can make your symptoms worse too.
If you are overweight, it puts extra pressure on your stomach and encourages the symptoms of heartburn. Losing some weight and following a healthy balanced diet may help you.
Smoking increases the amount of acid produced by the stomach and may make your symptoms worse. If you are a smoker, speak with your doctor or pharmacist about how to quit.
Do not take antacids at the same time as any other medicines. This is because they can interfere with the way your body absorbs other medicines and may stop them from working properly. Try to leave at least two hours both before and after a dose of magnesium trisilicate before you take any other medicines.
Many magnesium trisilicate preparations contain significant amounts of sodium. If you are on a low-sodium diet, please get advice from a pharmacist about which antacid preparations are suitable for you to take.
Can magnesium trisilicate cause problems?
Occasionally, people who have taken this medicine have experienced digestive symptoms such as mild diarrhoea, stomach cramps and belching. Other side-effects are unlikely but if you do experience any other symptoms, speak with your doctor or pharmacist for further advice.
How to store magnesium trisilicate
Gardez tous les médicaments hors de la portée et de la vue des enfants.
Conserver dans un endroit frais et sec, à l'abri de la chaleur et de la lumière directes.
Check the label on the bottle for an expiry date. Once a bottle of mixture has been opened, it may need to be either used within a period of time (often 28 days), or discarded.
Informations importantes sur tous les médicaments
Informations importantes sur tous les médicaments
If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.
Si vous subissez une opération ou un traitement dentaire, informez la personne qui effectue le traitement des médicaments que vous prenez.
Ne gardez pas de médicaments périmés ou indésirables. Apportez-les à votre pharmacie locale qui s'en débarrassera pour vous.
Si vous avez des questions concernant ce médicament, demandez à votre pharmacien.
Signaler les effets secondaires d'un médicament ou d'un vaccin
Si vous ressentez des effets secondaires, vous pouvez les signaler en ligne via le Site web de Yellow Card.

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Questions fréquemment posées
What is the primary difference between the liquid and tablet forms of magnesium trisilicate?
Liquid mixtures of magnesium trisilicate are generally considered more effective than the tablet preparations in neutralising stomach acid. However, tablets are often more convenient for people to use.
Are there any specific situations where I should avoid taking magnesium trisilicate, even if I have indigestion?
Yes, you should seek advice from a pharmacist or doctor before taking magnesium trisilicate if you experience symptoms like difficulty swallowing, blood loss, weight loss, or vomiting. Also, if you have pre-existing kidney or liver problems, low blood phosphate, are allergic to antacids, or are pregnant, you should consult a professional first.
What is the recommended dosage for children?
For children aged 5 to 12 years, the recommended dose is 5-10 ml (one or two 5 ml spoonfuls). This can usually be taken three times daily between meals and at bedtime, or whenever needed, up to once an hour.
How long should I wait after taking magnesium trisilicate before taking my other medications?
You should leave at least two hours both before and after taking a dose of magnesium trisilicate before taking any other medicines. This is because antacids can interfere with how your body absorbs other medications.
Does magnesium trisilicate contain sodium?
Yes, many magnesium trisilicate preparations contain significant amounts of sodium. If you are on a low-sodium diet, you should ask a pharmacist for advice on suitable antacid preparations.
What should I do if I experience side effects other than mild digestive issues?
Occasionally, people experience mild diarrhoea, stomach cramps, and belching. However, if you experience any other unexpected symptoms, you should speak with your doctor or pharmacist for further advice.
How should I dispose of expired or unused magnesium trisilicate?
Do not keep out-of-date or unwanted medicines at home. You should take them to your local pharmacy, which will dispose of them for you safely.
Lectures complémentaires et références
- Manufacturer's PIL, Magnesium Trisilicate Mixture BP; Thornton & Ross Ltd, The electronic Medicines Compendium. Dated September 2020.
- Médicaments Complets BNF 89e Édition; Association Médicale Britannique et Société Royale Pharmaceutique de Grande-Bretagne, Londres.
À propos de l'auteurVoir la biographie complète

Michael Stewart, MRPharmS
Responsable de l'examen des notices de médicaments – Contractuel, Pharmacien
BPharm (Hons), MRPharmS
Michael est un pharmacien communautaire exerçant dans les Midlands et le South Yorkshire avec plus de 20 ans d'expérience dans le conseil sur les médicaments et les conditions médicales. Il possède une solide expérience en formation dans le domaine de la santé, ayant produit et dispensé des cours de formation pour les équipes de pharmacie et le personnel des établissements de soins résidentiels, y compris les infirmières. Il a également contribué aux comités consultatifs de pharmacie pour la gestion des affections de faible gravité dans la communauté.
À propos du critique

Sid Dajani
Sultan Dajani a obtenu son diplôme à la London School of Pharmacy en 1994 et est devenu le plus jeune membre élu du conseil de la Royal Pharmaceutical Society depuis sa fondation en 1842.
Historique de l'article
Les informations sur cette page sont rédigées et examinées par des cliniciens qualifiés.
Article également disponible en Anglais, Allemand, Espagnol, Français, Italien, Portugais, Hindi, Hébreu, Arabe, and Suédois.
Next review due: 18 Oct 2027
21 oct. 2024 | Dernière version

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