Can you get medical cannabis for fibromyalgia in the UK?

Fibromyalgia causes widespread pain, fatigue, unrefreshing sleep and cognitive fog, and it has few reliably effective treatments. That combination — high burden, poor options — is why it comes up so often in private medical cannabis consultations, and why the claims made about it deserve careful reading.

Is fibromyalgia treated with medical cannabis in the UK?

It is one of the conditions UK private specialists assess most often. It is not an NHS treatment: no cannabis-based product is licensed for fibromyalgia, and NICE guidance on chronic primary pain recommends against offering most pain medicines for it, cannabis-based medicines included.

NICE's position on fibromyalgia is unusual because it also recommends against much of what has traditionally been prescribed — including many opioids and paracetamol — in favour of exercise, psychological therapies and, in some cases, an antidepressant. It is not that cannabis has been singled out. It is that the whole pharmacological toolkit for fibromyalgia has thin evidence behind it.

A specialist considering fibromyalgia will therefore want to know that the non-drug approaches have genuinely been tried, not just mentioned.

What the evidence actually shows

The randomised evidence in fibromyalgia is small-scale and short-term. It shows measurable effects, which is more than nothing, and it does not show durable benefit, which is what patients actually want to know about.

The most-cited controlled study inhaled pharmaceutical-grade cannabis in twenty patients with fibromyalgia in a randomised, placebo-controlled four-way crossover design, comparing THC-dominant, CBD-dominant and combined varieties against placebo. Products containing THC produced measurable analgesic effects on experimental pain measures; CBD alone did not. With twenty participants and a single-session design, this tells you something about pharmacology and very little about what happens over months.

UK registry data reports improvements in fibromyalgia-specific and quality-of-life measures over longer follow-up, with the same observational caveat that applies throughout this field: patients who stay in treatment and answer questionnaires are not a random sample.

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 fibromyalgia they will typically look at:

• Whether fibromyalgia has been formally diagnosed, and by whom
• Whether other causes of widespread pain and fatigue have been excluded
• What you have tried: exercise programmes, psychological therapy, amitriptyline, duloxetine, pregabalin
• How much of the burden is pain, how much is sleep, and how much is fatigue and cognitive fog
• Other conditions that commonly travel with fibromyalgia, including anxiety, depression and IBS
• Your personal and family history of psychosis, and your current mental health

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

Fatigue and cognitive fog are already part of fibromyalgia, and THC can worsen both. That is the specific risk worth naming here: a medicine that reduces your pain score while making the brain fog worse has not necessarily helped you.

The usual cautions apply — driving impairment, drowsiness, dizziness, dry mouth — and a personal or family history of psychosis, unstable mental illness, pregnancy or breastfeeding will normally count against treatment. Because fibromyalgia often coexists with anxiety and low mood, a careful specialist assesses those directly rather than assuming a pain medicine will fix them.

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 fibromyalgia 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