Mésalazine
Asacol, Octasa, Pentasa
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 22 Feb 2025
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There are a number of different brands of mesalazine, some of which work in different ways. This means that your treatment could be affected by switching between some brands. Each time you collect a new supply from your pharmacy, check to see if it is the same brand as before. If it is different, discuss this with your pharmacist who will advise you.
It is important that you keep your regular appointments with your doctor so that your progress can be checked. You may require regular blood tests.
Common side-effects include gastrointestinal symptoms and aches and pains. These tend to be minor.
Rarely, mesalazine can cause problems with your blood. You should tell your doctor immediately if you have any unexplained bleeding, bruising, red or purple discolourations of the skin, sore throat, a high temperature (fever), or if you feel generally unwell.
En un coup d'œil
Mesalazine is a medicine used to treat inflammatory bowel diseases like ulcerative colitis and Crohn's ileo-colitis.
It works by reducing inflammation in your intestine to help it recover and prevent symptom flare-ups.
It is available as tablets, granules, suppositories, enemas, and foam enemas.
Your doctor will advise on the specific brand and how to take it.
Possible side-effects include indigestion, sickness, diarrhoea, headache, and muscle aches.
Contact your doctor immediately if you have unexplained bleeding, bruising, a sore throat, high temperature, or allergic reactions.
About mesalazine
Type de médicament | An aminosalicylate |
Utilisé pour | Ulcerative colitis and Crohn's ileo-colitis |
Aussi appelé | Mesalamine (in US); Asacol®, Mezavant®, Octasa®, Pentasa®, Salcrozine®, Salofalk®, Zintasa® |
Disponible sous forme de | Tablets, granules (sachets), suppositories, enemas, and foam enemas (rectal foam) |
Ulcerative colitis causes inflammation of the intestine which leads to problems such as ulceration and bleeding. This causes symptoms such as abdominal pain and diarrhoea. maladie de Crohn is a condition which causes inflammation of any part of the gastrointestinal system. When the inflammation is in the area where the small intestine joins the large intestine, then it is called Crohn's ileo-colitis. Aminosalicylates are a group of medicines commonly used to treat inflammatory bowel diseases such as these. Mesalazine is one of the most commonly used aminosalicylates.
Although it is not clear exactly how mesalazine works, it is thought to act on cells lining the intestine to change the way these cells make and release certain chemicals. These chemicals are thought to be a factor in causing the symptoms of ulcerative colitis. Mesalazine allows the damaged intestine to recover and helps to prevent symptoms from flaring up again.
There are a number of different mesalazine preparations and brands. The way the manufacturers make each of these brands differs slightly; this allows the different brands to release mesalazine in specific areas of the intestine. You will be prescribed the brand that allows mesalazine to be released in the part of your intestine which requires it most.
Mesalazine can be taken by mouth as granules or tablets, or it can be given into the back passage as a suppository, rectal foam or enema.
Before taking mesalazine
Some medicines are not suitable for people with certain conditions, and sometimes a medicine can only be used if extra care is taken. For these reasons, before you start taking mesalazine it is important that your doctor knows:
If you are pregnant or breastfeeding. (Although mesalazine is unlikely to be harmful to babies, it is still important that you tell your doctor if you are expecting or breastfeeding a baby.)
Si vous avez des problèmes avec le fonctionnement de votre foie, ou si vous avez des problèmes avec le fonctionnement de vos reins.
Si vous avez des problèmes de respiration.
If you have ever had an allergic reaction to a medicine. It is particularly important that you tell your doctor if you have had an unusual reaction to aspirin or a salicylate.
Si vous prenez ou utilisez d'autres médicaments. Cela inclut tous les médicaments que vous prenez et qui sont disponibles à l'achat sans ordonnance, ainsi que les médicaments à base de plantes et complémentaires.
How to take mesalazine
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about mesalazine, and it will also provide you with a full list of the side-effects which you could experience.
Your dose will depend upon which brand of mesalazine has been prescribed for you. Your doctor will tell you how much to take and when to take it, and these directions will also be printed on the label of the pack to remind you about what the doctor said to you. Take mesalazine exactly as your doctor tells you to.
Some mesalazine tablets and granules are specially coated to pass through your stomach before they are absorbed. These must be swallowed whole and not broken, chewed or crushed. Check the label on your pack carefully and follow any advice it gives. Also, do not take any indigestion remedies within two hours of taking your doses (either before or after), as this will interfere with the special coating.
If you have been given the Mezavant® XL brand of tablets, you should take these after a meal. If you have been given any other brand of tablet, it is unimportant whether you take them before or after a meal.
If you have been given granules, place the correct amount on to your tongue and wash them down with a drink of water. Do not chew the granules. You can take them either before or after meals. Alternatively the entire contents of the sachet can be poured onto a yoghurt and eaten straightaway.
If you forget to take a dose, take it as soon as you remember (unless it is nearly time for your next dose, in which case leave out the missed dose and take the next dose as normal). Do not take two doses together to make up for a forgotten dose.
How to use mesalazine enema
Shake the enema and release the seal on the nozzle.
Lie down on one side and draw your top knee up towards your chest. Insert the enema nozzle into your back passage.
Squeeze the bottle gently to completely empty the contents. This will take around 30-40 seconds. Remove the nozzle from your back passage. Remain where you are for about 5-10 minutes until the urge to pass the enema has eased.
Throw away the empty enema bottle in a plastic bag (these are provided with some brands of enema).
Lavez-vous les mains.
How to use mesalazine foam enema
Shake the can well to mix the contents.
Before you use the can for the first time, remove the plastic safety lock.
Push the plastic applicator on to the nozzle of the can.
Stand up and place one foot on a firm surface, such as a chair.
Hold the canister upside down (with the dome facing down) in the palm of your hand.
Insert the applicator into your back passage as far as is comfortable.
Push the dome once and release it. This will release one dose of the foam. Repeat if you need two doses.
Remove the applicator and place it in one of the plastic bags provided and dispose of it in a bin.
Lavez-vous les mains.
How to use mesalazine suppositories
Remove the suppository from the packaging.
Using your finger, gently push the suppository into your back passage (rectum). Some people find it helps to squat, or to lie down on one side and draw their knees up towards their chest to do this.
Push the suppository in as far as is comfortable. You may have the urge to pass the suppository out again but this should ease after a few minutes.
Lavez-vous les mains.
Tirer le meilleur parti de votre traitement
Each time you collect a new supply from your pharmacy, check to see if it is the same brand as before. If it is different, discuss this with your pharmacist who will advise you.
Try to keep your regular appointments with your doctor and clinic. This is so your doctor can check on your progress. Your doctor will want you to have regular blood tests during the treatment.
Treatment with mesalazine may be long-term to prevent symptom flare-ups. Continue to take/use it unless you are advised otherwise.
Your doctor may advise you make some changes to your diet as part of your treatment. This can include a special diet or a nutritional supplement.
It is important to stay hydrated whilst being treated with mesalazine, ensure you drink the recommended amount of fluids each day.
You may notice a red-brown discolouration of urine when in contact with certain bleaches used to clean toilets. This is not harmful.
Can mesalazine cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains the most common ones associated with mesalazine. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Common mesalazine side-effects (these affect fewer than 1 in 10 people) | Que puis-je faire si je ressens cela ? |
Indigestion, feeling sick (nausea) or being sick (vomiting), tummy (abdominal) pain | Optez pour des aliments simples - évitez les repas riches ou épicés |
Diarrhée | Buvez beaucoup d'eau pour remplacer les fluides perdus |
Maux de tête, douleurs musculaires et courbatures | Buvez beaucoup d'eau et demandez à votre pharmacien de vous recommander un analgésique approprié. Si la douleur persiste, informez-en votre médecin |
Important: rarely, mesalazine can cause problems with your blood. You should contact your doctor immediately if you have any unexplained bleeding, bruising, red or purple discolourations of your skin, an unexplained sore throat or high temperature (fever), or if you feel generally unwell during the treatment.
In rare cases mesalazine can cause serious allergic skin reactions. Contact your doctor if you develop any signs of an allergic reaction including skin rashes and mouth ulcers.
Si vous ressentez d'autres symptômes que vous pensez être dus au médicament, parlez-en à votre médecin ou à votre pharmacien pour obtenir des conseils supplémentaires.
How to store mesalazine
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.
Informations importantes sur tous les médicaments
Informations importantes sur tous les médicaments
Si vous achetez des médicaments, vérifiez avec un pharmacien qu'ils sont sûrs à prendre avec vos autres médicaments.
Never take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine go to the accident and emergency department of you local hospital at once. 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.
Ce médicament est pour vous. Ne le donnez jamais à d'autres personnes, même si leur état semble être le même que le vôtre.
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 should I do if I notice a red-brown discolouration in the toilet after using mesalazine?
You may notice a red-brown discolouration of your urine when it comes into contact with certain bleaches used to clean toilets. This is not harmful and there is no need to be concerned.
Is it important for me to consistently use the same brand of mesalazine?
Each time you collect a new supply from your pharmacy, you should check to see if it is the same brand as before. If it is different, discuss this with your pharmacist who will advise you on whether this is acceptable or if you should seek the original brand.
Are there any specific dietary recommendations while taking mesalazine?
Your doctor may advise you to make some changes to your diet as part of your treatment with mesalazine. This could include a special diet or a nutritional supplement. It is also important to stay well-hydrated, so ensure you drink the recommended amount of fluids each day.
What should I do if I forget to take a dose of mesalazine tablets or granules?
If you forget to take a dose, take it as soon as you remember, unless it is nearly time for your next scheduled dose. In that case, you should skip the missed dose and take your next dose as normal. Do not take two doses together to try and make up for a forgotten dose.
Can Mesalazine cause problems with my blood?
Rarely, mesalazine can cause problems with your blood. You should contact your doctor immediately if you experience any unexplained bleeding, bruising, red or purple discolourations of your skin, an unexplained sore throat or high temperature (fever), or if you feel generally unwell during the treatment.
Lectures complémentaires et références
- Manufacturer's PIL, Octasa® 400 mg MR Tablets; Tillotts Pharma UK Limited, electronic Medicines Compendium. Dated January 2023.
- Manufacturer's PIL, Octasa® suppositories 1 g; Tillotts Pharma UK Limited, The electronic Medicines Compendium. Dated January 2023.
- Manufacturers PIL, Pentasa® enema; Ferring Pharmaceuticals Ltd, The electronic Medicines Compendium. Dated January 2023.
- Manufacturer's PIL, Pentasa® Sachet 1 g, 2 g and 4 g prolonged release granules; Ferring Pharmaceuticals Ltd, The electronic Medicines Compendium. Dated February 2021.
- 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.
Prochaine révision prévue : 22 fév. 2028
22 Feb 2025 | Dernière version

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