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Mesalazine for inflammatory bowel disease (IBD)

Mesalazine (also known as mesalamine) is one of a group of medicines called aminosalicylates (5-ASAs) and is one of the most commonly used aminosalicylates. It is used to treat ulcerative colitis and Crohn’s disease (more commonly ileocolitis) - which are both forms of inflammatory bowel disease (IBD).

It’s not known exactly how mesalazine works but it is thought to affect the way the cells lining the intestine make and release certain chemicals which are thought to have an affect on IBD.

There are various different brands of mesalazine and they are all manufactured in slightly different ways to allow the mesalazine to be released in the part of the intestine which requires it the most. The type of mesalazine you are prescribed will depend on where your IBD is.

What are the different brands of mesalazine available?

There are many different brands of mesalazine available. These include:

  • Asacol
  • Ipocol
  • Mezavant
  • Octasa
  • Pentasa
  • Salofalk

The different brands are all produced slightly differently and may target slightly different areas of the intestines so it’s important to check the brand you receive from your doctor when picking up a new supply.

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How is mesalazine taken?

There are a few different preparations of mesalazine. These include:

  • Tablets taken by mouth
  • Granules taken by mouth
  • Suppositories placed up the back passage
  • Rectal foam placed up the back passage
  • Enema (fluid) placed up the back passage

Are there any potential side effects of mesalazine?

As with most medications some people can experience side effects when taking them. Reported side effects vary between the different brands but some of the common side effects include:

  • Indigestion
  • Feeling or being sick
  • Abdominal pain
  • Bloody diarrhoea
  • Headaches
  • Muscle aches and pains
  • Blurred vision
  • Dizziness
  • Fever
  • Feeling full or bloated
  • Nervousness
  • Pounding in the ears
  • Pressure in the stomach
  • Skin rash and itching
  • Slow or fast heartbeat
  • Abdominal or stomach swelling
  • Unusual tiredness or weakness

In rare cases mesalazine can cause problems with your blood. If you have any unexplained bleeding, bruising, red or purple discolourations of your skin, a sore throat, fever or if you feel generally unwell contact your doctor immediately.

Is there anything I should know before taking mesalazine?

Before taking mesalazine you should let your doctor know if any of the following apply to you:

  • You are pregnant, trying for a baby or breastfeeding
  • You have any problems with your liver or kidneys
  • You’ve had an allergic reaction to a medicine in the past (especially if this is aspirin or salicylates)
  • You are taking other medicines (including non-prescription, herbal and complementary medicines)

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