Can you get medical cannabis for PTSD in the UK?

Post-traumatic stress disorder is among the more common reasons for private medical cannabis prescriptions in the UK. It is also a condition with genuinely effective evidence-based treatments — trauma-focused psychological therapies — which is why a specialist will ask carefully whether you have had proper access to them.

Is PTSD treated with medical cannabis in the UK?

PTSD is assessed by private specialists and is one of the more frequent reasons for private prescriptions in the UK. It is not an NHS use, nothing is licensed for it, and NICE does not recommend cannabis-based medicines for PTSD.

NICE guideline NG116 recommends trauma-focused cognitive behavioural therapy or EMDR as first-line treatment for PTSD, with medication — usually an SSRI or venlafaxine — considered where someone declines therapy or where it has not helped. These therapies work for many people, and access to them on the NHS is variable, which is a service problem rather than a reason to conclude they do not work.

A specialist assessing PTSD will want to understand what you have had access to, what happened, and whether the priority is nightmares, hyperarousal, avoidance or something else. Those respond differently, and vague requests get vague treatment.

What the evidence actually shows

PTSD is one of the few conditions here with a randomised placebo-controlled trial, and it did not show what people hoped. That result is worth stating plainly, because it is often left out of clinic summaries.

The first controlled trial of smoked cannabis for PTSD, published in PLOS ONE, randomised 80 US military veterans with chronic PTSD to three weeks of high-THC, high-CBD, combined THC:CBD, or placebo cannabis. All groups, placebo included, showed significant improvement in PTSD symptoms, and no active preparation was significantly better than placebo. Tolerability was good and no safety concerns emerged. The honest reading is that three weeks of any of these produced improvement, and the trial could not attribute it to the cannabis.

Against that, an updated UK Medical Cannabis Registry analysis of 269 PTSD patients followed for 18 months reported significant improvements in PTSD symptoms, anxiety, sleep quality and quality of life at every follow-up point, with adverse events in about a quarter of patients — most commonly insomnia and fatigue. Observational data of that kind cannot separate treatment from the many other things that change over 18 months.

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 post-traumatic stress disorder they will typically look at:

• The nature and timing of the trauma, and whether PTSD has been formally diagnosed
• Whether you have had trauma-focused CBT or EMDR, and if not, what stood in the way
• Which medicines you have tried — SSRIs, venlafaxine, prazosin for nightmares — and what happened
• Which symptoms matter most to you: nightmares, sleep, hypervigilance, flashbacks, avoidance
• Any personal or family history of psychosis, and your current mental health including risk of self-harm
• Your alcohol and drug use, which is common in PTSD and needs to be part of the plan rather than hidden from it

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 most important caution in PTSD is that a medicine which dampens symptoms can also reduce the drive to engage with therapy that would treat the condition. Avoidance is a feature of PTSD, and treatment should not become part of it.

THC can worsen anxiety, paranoia and sleep disturbance in some people. A personal or family history of psychosis weighs heavily against it. Substance use and dependence are more common in PTSD, and regular THC use can lead to dependence with a withdrawal syndrome — irritability, poor sleep, restlessness — that closely mimics worsening PTSD. Specialists take a full substance history for this reason, and being open about it improves your care rather than jeopardising it.

If you are in crisis or having thoughts of harming yourself, contact your GP or NHS 111, or call 999 in an emergency. Samaritans are available free on 116 123 at any time. Veterans in England can contact Op COURAGE, the NHS veterans mental health service.

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 post-traumatic stress disorder 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