Mesalazina
Asacol, Octasa, Pentasa
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 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.
De un vistazo
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
Tipo de medicamento | An aminosalicylate |
Usado para | Ulcerative colitis and Crohn's ileo-colitis |
También llamado | Mesalamine (in US); Asacol®, Mezavant®, Octasa®, Pentasa®, Salcrozine®, Salofalk®, Zintasa® |
Disponible como | 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. enfermedad 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. Aminosalicilatos 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 tienes algún problema con el funcionamiento de tu hígado, o si tienes algún problema con el funcionamiento de tus riñones.
Si tienes algún problema con tu respiración.
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 está tomando o usando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
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.
Si olvida tomar una dosis, tómela tan pronto como lo recuerde (a menos que esté casi la hora de su próxima dosis, en cuyo caso omita la dosis olvidada y tome la siguiente como de costumbre). No tome dos dosis juntas para compensar una dosis olvidada.
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).
Lávese las manos.
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.
Lávese las manos.
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.
Lávese las manos.
Obteniendo el máximo de tu tratamiento
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) | ¿Qué puedo hacer si experimento esto? |
Indigestion, feeling sick (nausea) or being sick (vomiting), tummy (abdominal) pain | Mantente en alimentos simples - evita comidas ricas o picantes |
Diarrea | Bebe mucha agua para reponer los líquidos perdidos |
Headache, muscle aches and pains | Bebe mucha agua y pide a tu farmacéutico que te recomiende un analgésico adecuado. Si los dolores continúan, informa a tu médico |
Importante: 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 experimenta otros síntomas que cree que pueden deberse al medicamento, hable con su médico o farmacéutico para obtener más consejos.
How to store mesalazine
Mantenga todos los medicamentos fuera del alcance y la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros medicamentos.
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 vas a someterte a una operación o tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos por ti.
Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.
Informar efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
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.
Lecturas adicionales y referencias
- 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.
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

Michael Stewart, MRPharmS
Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico
BPharm (Hons), MRPharmS
Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.
Acerca del revisor

Sid Dajani
Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 22 de febrero de 2028
22 Feb 2025 | Última versión

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