Medication options for inflammatory bowel disease (IBD)

There are various medications which may be given to people with inflammatory bowel disease (IBD) to try to control their symptoms and get them into remission. They fall into four main categories:

Which medication (and even which brand) you are given will depend on the type of Crohn’s disease, ulcerative colitis or microscopic colitis you have, your IBD symptoms and the response you have had to any other medication you have taken.

The following is provided as information only.

Aminosalicylates (5-ASA)

Aminosalicylates are usually the first medicines prescribed to people newly diagnosed with IBD. They may be given as tablets, liquid, creams or suppositories to people with mild to moderate ulcerative colitis and mild Crohn’s disease. They may be taken orally or via your back passage. Aminosalicylates are usually more effective for people with ulcerative colitis than with Crohn’s disease, but the effectiveness varies greatly from person to person.

The medicine works to reduce inflammation in the gut, although the exact way it works is not fully understood. Aminosalicylates contain 5-aminosalicylic acid (5-ASA).

Types of aminosalicylates - or 5-ASAs - include:

There may also be some other brands available not mentioned above.

As with all medications some people may experience side effects. Common side effects include headache, nausea, abdominal pain and cramping, loss of appetite, vomiting, rash, or fever. 5-ASA agents can also cause diarrhoea in a small number of users, though it can be difficult to distinguish if the diarrhoea is as a result of the medication or from your IBD.

Rarely aminosalicylates can cause problems with your blood and you should tell your doctor immediately if you have any unexplained bleeding, bruising, red or purple discolourations of the skin, sore throat, high temperature (fever) or if you feel generally unwell during treatment. You should discuss potential side effects with your doctor before taking the medication and read the patient information leaflet which comes with the medication.

They should not be used by people with known kidney problems.

Corticosteroids

Corticosteroids work to reduce inflammation for people with all forms of IBD - Crohn’s disease, ulcerative colitis and microscopic colitis. They are also immunosuppressive - meaning they suppress the immune system. As a result some people find they are more susceptible to catching infections.

Corticosteriods are often given if aminosalicylates have not been effective. They are powerful and fast-acting and help to reduce symptoms quickly, often within days. Once you are in ‘remission’ (a period without symptoms) your doctor will slowly reduce your dose of corticosteriods until you no longer take them.

They may be given as tablets, liquid, creams or suppositories to be taken orally, via your back passage or as topical creams. For some people, with severe cases of IBD, they may be given corticosteroids intravenously into their vein (usually done in hospital).

Types of corticosteroids include:

There may also be some other brands available not mentioned above.

Corticosteroids should not be used long-term as they can have undesirable side effects. Side effects include round of the face (known as moon face), weight gain, acne, osteoporosis, insomnia and mood swings.

Immunomodulators

Immunomodulator medicines weaken or suppress the immune system. This decreases the inflammatory response the body has which is thought to play a role in IBD flares.

They are given if other medications have not been effective in controlling IBD symptoms or to avoid long-term corticosteroid use. Azathioprine and 6-Mercaptopurine are both also used in the treatment of fistulas. They are taken orally as tablets, although some forms can also be applied topically or given as injections.

Types of immunomodulators include:

Azathioprine and 6-Mercaptopurine can take between 3-6 months to work so may be combined with another medication, such as corticosteroids, initially.

As immunomodulators suppress the immune system you may be susceptible to catching infections more easily. They can also have an effect on bone marrow, liver and kidneys, therefore you may be required to have regular blood tests to check these.

As with all medications some people experience side effects. The reported side effects vary depending on the type of immunomodulator taken. You should discuss what these side effects are with your doctor before taking the medication.

Biologics

Biologics are genetically engineered from living organisms and target specific proteins and enzymes in your body that cause inflammation. They are more targeted than some other medications used for IBD which suppress the whole immune system.

Different types of biologics target different proteins and enzymes thought to play a role in IBD. The targets include tumor necrosis factor (TNF)-alpha, interleukins, adhesion molecules and colony-stimulating factors.

Biologics are the newest medication to be used to treat Crohn’s disease and ulcerative colitis.

Types of biologics include:

How the biologic is given, and the frequency at which it is given, depends on the type of biologic your doctor thinks is best for you.

Infliximab, natalizumab and vedolizumab are all given via intravenous infusions, usually in a hospital or at a medical centre.

Adalimumab, certolizumab pegol, cimzia and golimumab are given by injection. Some patients may be able to inject themselves at home.

Biosimilars are imitations of biologic drugs which have already been registered for use. In recent years the number of biosimilar medicines has increased and you may be given a biosimlar instead of one of the brands listed above. Biosimilars are not identical to the biologic they are imitating, but are very similar.

Side effects of biologics may include: headache, fever, chills, difficulty breathing, low blood pressure, and hives. Additionally, patients may experience stomach pain, back pain, rash, nausea, and upper respiratory infection (cough and sore throat).

You should discuss potential side effects with your doctor before taking the medication and read the patient information leaflet which comes with the medication.

What other medications are given for IBD?

As well as the medications above you may also be given some medications to help with other symptoms you experience as a result of your IBD.

Antacids

Antacids work to control acid levels in your stomach for people who suffer from heartburn, acid reflux and indigestion.

Read more about antacids and who can't take antacids.

Proton-pump inhibitors

PPIs are used to reduce gastric acid production and include omeprazol, esomeprazole, lansoprazole, pantoprazoleand rabeprazole. They are commonly used to treat acid reflux and ulcers of the stomach and part of the small intestine called the duodenum.

Pain relief

Unfortunately for some people with IBD pain is an everyday occurrence and can severely affect your quality of life. There are a range of pain relief options which you may be given, depending on the what and where the pain is. These include:

Read an overview of some common painkillers.

Before taking any medication please speak to your doctor as there are some medications which are not advised be taken if you have IBD (such as ibuprofen) or if you are already taking other medication.

Antibiotics

You may be given antibiotics if you are found to have an infection (such as Clostridium difficile (C. diff)), an abscess or fistula. For some people they are also given for the specific treatment of IBD.

Read more about antibiotics.

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