Can you get medical cannabis for ulcerative colitis or IBD in the UK?

Ulcerative colitis and Crohn's disease are assessed by UK private specialists, and the trials here have produced an unusually clear and unusually important finding: symptoms improve while the inflammation does not. That distinction is the whole point of this page.

Is inflammatory bowel disease treated with medical cannabis in the UK?

IBD is assessed by private specialists, for symptoms that persist despite the disease being treated. It is not an NHS treatment, nothing is licensed for it, and it is not a treatment for the inflammation itself.

Crohn's disease and ulcerative colitis are managed by gastroenterology using aminosalicylates, corticosteroids, immunomodulators such as azathioprine, biologics and, where needed, surgery — with the goal of controlling inflammation and preventing complications. Symptom relief matters, but it is not the same objective, and the two can come apart.

This guide covers inflammatory bowel disease as a whole, and ulcerative colitis in particular. Crohn's disease has its own guide, which goes further into the Cochrane review and the trials specific to it: Can you get medical cannabis for Crohn's disease?

In IBD, feeling better while inflammation continues is a specific and serious risk. Untreated inflammation causes strictures, fistulas, bowel damage and increased cancer risk over time. Symptom relief that masks that is harmful, which is why continued gastroenterology review and monitoring is non-negotiable.

What the evidence actually shows

IBD is the clearest example in this whole field of a treatment improving how people feel without improving the disease. Both randomised trials point the same way.

An early placebo-controlled study in Crohn's disease found that smoked cannabis improved Crohn's Disease Activity Index scores, with clinical remission in a minority — but no improvement in inflammatory markers, and the trial did not meet its primary endpoint. A later randomised controlled trial published in the Journal of Crohn's and Colitis gave 56 patients CBD-rich cannabis oil or placebo for eight weeks: the cannabis group had greater symptom score reduction and better quality of life, while endoscopic scores and inflammatory markers were unchanged. The title says it directly — clinical but not endoscopic response.

UK Medical Cannabis Registry data in 116 IBD patients reports improvements in IBD-specific quality of life, anxiety, sleep and general health measures over 18 months, with the usual observational caveat. None of this is evidence of an anti-inflammatory effect in people.

What a specialist will want to see

There is no UK list of qualifying conditions, so nothing here entitles you to a prescription. A specialist works through your history and decides whether a monitored trial is justified for you. For inflammatory bowel disease they will typically look at:

• Whether you have Crohn's disease or ulcerative colitis, and how active it currently is
• Your current IBD treatment and whether disease control is actually adequate
• Recent inflammatory markers, faecal calprotectin and endoscopy findings
• Which symptoms persist despite good disease control — pain, urgency, appetite, fatigue, sleep
• Whether you have had surgery, strictures or fistulas, which change the risk picture
• That your gastroenterology team knows and continues to monitor you

The general requirements — age, a documented diagnosis, the convention that two standard treatments have been tried, and access to your medical records — are covered in What are the requirements?

Risks and reasons a specialist may say no

The headline risk in IBD is masking. If pain and urgency improve while inflammation continues unchecked, damage accumulates silently — and the improvement itself can reduce the urgency of follow-up.

There are practical risks too. Cannabis can slow gut motility, which is unhelpful where strictures are present. Malnutrition and weight loss are common in active IBD, and appetite effects cut in both directions. Regular use has been associated in some observational studies with an increased likelihood of surgery in Crohn's disease, which may reflect symptom masking rather than a direct effect. The general cautions — drowsiness, driving impairment, psychosis history, pregnancy — apply as elsewhere.

If you want to take this further

The useful next step is a proper assessment, not a better list. Gather your diagnosis, the treatments you have already tried and what happened with each, and your current medicines — that is what a specialist needs in order to give you a straight answer.

The consultation itself, and what happens after it, is set out in What is the process to get a medical cannabis prescription? If inflammatory bowel disease is not the only thing you are being treated for, say so early: other conditions and other medicines change the assessment.

Patient guide · Written by the Flora House editorial team · Last reviewed: 31 August 2026