The short answer
The UK regulations don’t list conditions. The 2018 framework sets three tests — specialist on the GMC’s register, unmet clinical need, named-patient basis — and leaves the clinical judgement to the prescribing doctor. In practice, UK specialists prescribe across four broad areas: chronic pain and inflammation; mental health and sleep; neurological and neurodevelopmental; and gastrointestinal and autoimmune conditions. Plus cancer-related pain and nausea.
If conventional treatments for your condition haven’t given lasting relief, you may be a candidate — but the decision rests with a specialist on the GMC’s register, on the basis of your full medical history.
What “unmet clinical need” really means
The phrase appears in every honest description of UK medical cannabis prescribing. It means: you have a condition that has not responded adequately to licensed treatments, either because those treatments haven’t worked, haven’t been tolerated, or are contraindicated for you specifically.
In practice most patients have tried two or more licensed alternatives before being prescribed cannabis-based medicine. That’s not a strict legal requirement — the law doesn’t set a treatment threshold — but it’s the most common clinical pattern.
Chronic pain and inflammation
The largest cluster of UK medical cannabis prescriptions. Specialists most commonly prescribe for:
- Fibromyalgia — widespread musculoskeletal pain with fatigue and sleep disturbance.
- Arthritis — rheumatoid, osteoarthritis, ankylosing spondylitis.
- Neuropathic pain — nerve-origin pain including post-surgical and post-shingles.
- Endometriosis pain — chronic pelvic pain where hormonal and surgical options haven’t given lasting relief.
- Chronic back, joint, and MSK pain.
- Migraines and cluster headaches — chronic and treatment-resistant.
- Cancer-related pain — alongside oncology care.
Mental health and sleep
The second-largest cluster:
- Treatment-resistant anxiety — generalised, social, panic-spectrum.
- Depression — where licensed antidepressants haven’t worked or aren’t tolerated.
- PTSD — particularly for veterans and survivors of trauma.
- ADHD — typically as an adjunct alongside licensed stimulants.
- Insomnia and chronic sleep disorder.
Mental health prescribing requires a psychiatrist on the GMC’s Specialist Register. It is not, and should not be, a first-line treatment.
Neurological and neurodevelopmental
The smallest cluster by patient numbers but with strong NICE recognition:
- Multiple sclerosis (MS) — spasticity, particularly. Sativex has NICE approval.
- Treatment-resistant epilepsy — Epidyolex has NICE approval for specific paediatric indications.
- Parkinson’s disease — tremor, sleep disturbance, non-motor symptoms.
- Tourette’s syndrome — motor and vocal tics.
- Conditions associated with autism — anxiety, sleep, sensory dysregulation in adult patients.
Gastrointestinal and autoimmune
- Crohn’s disease and ulcerative colitis.
- Irritable bowel syndrome (IBS) — the visceral pain and sleep disturbance.
- Lupus and rheumatoid arthritis — alongside DMARDs.
Cancer support
UK specialists prescribe for cancer-related symptoms, not as cancer treatment:
- Chemotherapy-induced nausea and vomiting (Nabilone has NICE approval).
- Cancer-related pain, particularly when opioid tolerance is an issue.
- Cancer-related anxiety and depression.
Medical cannabis is prescribed for the symptoms of cancer, not as a cancer treatment. We won’t make claims that aren’t ours to make.
If your condition isn’t listed
The lists above describe the most common indications — not the only ones. UK specialists prescribe medical cannabis for a much wider range of conditions on a case-by-case basis. What matters is your history and what’s been tried.
How the framework decides
Three things a UK specialist will weigh:
- Have conventional treatments been tried?
- Why haven’t they worked? Lack of efficacy, side-effects, contraindications, or tolerance.
- Is there clinical evidence the medication could help your specific case?
How Xen Health fits in
Every consultation at Xen Health is matched to the right specialist for your condition — pain medicine, psychiatry, neurology, gastroenterology. Your first consultation is complimentary; no GP referral required.
This article is for general information. It is not medical advice and is not a substitute for a consultation with a qualified specialist. Whether medical cannabis is appropriate for any individual is a clinical decision that rests with the prescribing doctor on the basis of medical history and a full assessment.