Hydroxyde de magnésium pour la constipation
Phillips' Milk of Magnesia
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 21 oct. 2024
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Magnesium hydroxide is a laxative for occasional use only.
Take a dose at bedtime with a glassful of water.
If you are taking other medicines, do not take magnesium hydroxide within two hours (before or after) of your other medicines.
En un coup d'œil
Magnesium hydroxide is a medicine used to treat occasional constipation and is available as a liquid.
It works by drawing fluid into your bowel, making stools softer and easier to pass.
Take it with a glass of water or milk at bedtime for up to three consecutive days.
Do not take it at the same time as other medicines, leave at least a two-hour gap.
Speak to a doctor or pharmacist before taking it if you are pregnant or have kidney or liver problems.
Stop taking it if you experience mild diarrhoea or stomach cramps.
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About magnesium hydroxide
Type de médicament | A laxative |
Utilisé pour | Constipation |
Aussi appelé | Phillips'® Milk of Magnesia |
Disponible sous forme de | Liquid mixture |
Constipation is a common problem. It can mean either going to the toilet less often than usual to empty your bowels, or passing hard or painful stools. Constipation can be caused by a number of things. Not eating enough fibre or not drinking enough fluid can cause constipation. Some conditions (such as pregnancy) can cause constipation, as can a lack of exercise or movement (such as being ill in bed), and some medicines. Often, increasing the amount of fibre in your diet (such as by eating more fruit, vegetables, cereals and wholemeal bread) and drinking plenty of water each day can effectively prevent or relieve constipation. A laxative such as magnesium hydroxide can also be helpful, if used occasionally.
Magnesium hydroxide works by drawing fluid into your bowel, which makes your stools softer and easier to pass. It can be bought without a prescription at pharmacies and other retail outlets.
Before taking magnesium hydroxide
Retour au sommaireTo make sure that this is the right treatment for you, ask a pharmacist or doctor for advice before you start taking magnesium hydroxide if:
You are pregnant. This is because if you are expecting a baby, medicines should only be taken on the advice of a doctor.
You have problems with the way your kidneys work, or problems with the way your liver works.
You have severe tummy (abdominal) pain, cramping, or sickness (vomiting).
You are taking any prescription medicines. This is because magnesium hydroxide can reduce the absorption of many medicines.
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How to take magnesium hydroxide
Retour au sommaireBefore you start taking the mixture, read the manufacturer's printed information attached to the pack. It will give you more information about magnesium hydroxide and how to take it.
Shake the bottle well to make sure the medicine is evenly mixed before pouring out a dose. The dose for an adult is 30-45 ml (six to nine 5 ml spoonfuls). The dose for a child aged 3-12 years is 5-10 ml (one or two 5 ml spoonfuls), although magnesium hydroxide should only be given to a child on the advice of a healthcare professional. Swallow the dose with a glass of water or milk at bedtime. The water/milk helps the magnesium hydroxide to work so it is important that you drink a glassful. It is also especially important if you are elderly, or at risk of becoming lacking in fluid in the body (dehydrated) for any reason.
Magnesium hydroxide is a laxative for occasional use only - do not take it for more than three consecutive days. It must not be taken to prevent constipation or to 'keep you regular'. If you are concerned about your bowel habit, please speak with your doctor for advice.
Do not take magnesium hydroxide at the same time as any other medicines. This is because it 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 hydroxide before you take any other medicines.
Tirer le meilleur parti de votre traitement
Retour au sommaireIt is important for you to drink plenty while you are constipated. Adults should aim to drink at least two litres (about 8-10 cups) of fluid per day. Most sorts of drink will do but as a start, try just drinking a glass of water 3-4 times a day in addition to what you normally drink.
Essayez de manger un régime équilibré contenant des aliments riches en fibres tels que des pains et céréales complets, des fruits et légumes, du riz brun et des pâtes complètes. Si vous n'êtes pas habitué à un régime riche en fibres, il peut être préférable d'augmenter progressivement la quantité de fibres que vous consommez.
Garder votre corps actif vous aidera à maintenir votre système digestif en mouvement, alors essayez de faire de l'exercice quotidiennement.
You may wish to include some foods in your diet that contain sorbitol. Sorbitol is a naturally occurring sugar. It is not digested very well and draws water into your bowel which has an effect of softening stools. Fruits (and their juices) that have a high sorbitol content include apples, apricots, gooseberries, grapes (and raisins), peaches, pears, plums, prunes, raspberries and strawberries.
You can read more about how to prevent or treat constipation in the separate condition leaflets called Constipation (for adults) and Constipation in Children.
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Can magnesium hydroxide cause problems?
Retour au sommaireOccasionally, people who have taken magnesium hydroxide have experienced digestive symptoms such as mild diarrhoea and stomach cramps. If either of these happens to you, stop taking it. Other side-effects are unlikely but if you do experience any other symptoms, speak with a doctor or pharmacist for further advice.
How to store magnesium hydroxide
Retour au sommaireGardez 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 used within a period of time, or discarded.
Informations importantes sur tous les médicaments
Retour au sommaireInformations 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.

Vous n'êtes pas sûr de mélanger des médicaments ?
Vérifiez les interactions possibles entre les médicaments, les compléments et les aliments avant de les prendre ensemble.
Questions fréquemment posées
What happens if I take magnesium hydroxide for more than three days in a row?
Magnesium hydroxide is meant for occasional use only and should not be taken for more than three consecutive days. If you find yourself needing a laxative for longer, or are concerned about your bowel habits, you should speak with your doctor for advice.
Can I take magnesium hydroxide at the same time as other medications?
No, you should not take magnesium hydroxide at the same time as other medicines. It can interfere with how your body absorbs them and stop them from working correctly. It is advised to leave at least two hours both before and after taking magnesium hydroxide before taking any other medications.
Are there any natural ways to help prevent constipation in addition to using magnesium hydroxide?
Yes, there are several lifestyle changes that can help prevent or treat constipation. These include drinking plenty of fluids (adults should aim for at least two litres daily), eating a balanced diet rich in high-fibre foods like wholemeal bread, fruits, and vegetables, and getting regular daily exercise. Additionally, consuming fruits and juices high in sorbitol, such as apples, pears, peaches, and prunes, can help soften stools.
Lectures complémentaires et références
- Manufacturer's PIL, Magnesium Hydroxide Mixture BP; Thornton & Ross Ltd, The electronic Medicines Compendium. Dated July 2020.
- Médicaments Complets BNF 89e Édition; Association Médicale Britannique et Société Royale Pharmaceutique de Grande-Bretagne, Londres.
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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.
Next review due: 18 Oct 2027
21 oct. 2024 | Dernière version

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