Can you get medical cannabis for depression in the UK?

Depression is one of the conditions people most often ask about and one of the few where the honest answer involves a genuine risk of making things worse. There is no randomised trial supporting it, and there is a recognised mechanism for harm.

Is depression treated with medical cannabis in the UK?

Rarely, and not as a primary indication. No cannabis-based product is licensed for depression, NICE guidance on depression does not include it, and most UK specialists will not prescribe for depression on its own.

Where depression does feature, it is usually as a secondary consideration alongside a primary physical condition — most often chronic pain, where low mood is both common and closely tied to the pain itself. That is a different clinical question from treating a depressive illness.

This is one of the places where our answer differs from a good deal of clinic marketing. We think you are better served by knowing that up front.

What the evidence actually shows

The most thorough review of cannabinoids in mental health examined the trial evidence across depression, anxiety, ADHD, Tourette syndrome, PTSD and psychosis. For depression it found there was insufficient evidence from controlled trials to support use, and that the available studies were mostly of low quality.

Where depressive symptoms improved in those trials, it was generally in people being treated for another condition — chronic pain in particular — which is consistent with mood lifting because the primary problem improved rather than because of a direct antidepressant effect.

Observational registry data does report improvement in depression scores. It cannot separate a drug effect from regression to the mean, the effect of finally being taken seriously by a clinician, or the fact that people who feel worse stop answering questionnaires.

What a specialist will want to see

Because the evidence is weak and the risk is real, assessment here is more cautious than for most physical conditions, and a decline is a common outcome.

• Whether depression is the primary problem or accompanies a physical condition
• What talking therapies you have had access to, and what happened
• Which antidepressants you have tried, at what dose, and for how long
• Any history of bipolar disorder, psychosis or psychotic symptoms
• Current suicidal thoughts, self-harm, or recent crisis contact
• Alcohol and other substance use, which frequently travels with low mood

If you are having thoughts of harming yourself, this is not the right route and not the right timescale. Speak to your GP, call NHS 111, contact the Samaritans on 116 123, or in an emergency call 999.

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

THC is not a reliably mood-lifting drug. It can increase anxiety, blunt motivation, and in some people lower mood — and regular use is associated with worse outcomes in depression rather than better ones.

The specific risk that closes the door is psychosis. A personal or family history of psychotic illness, or of bipolar disorder, will normally rule out treatment, and depression that has ever tipped into psychotic symptoms is assessed very cautiously indeed.

There is also an interaction question. Cannabis-based medicines can interact with sedatives and with some antidepressants, and adding a drowsiness-causing medicine to an existing one is a decision that needs a prescriber who can see your whole medicines list.

How medical cannabis is thought to help

Because the controlled evidence in depression is so weak, any account of a mechanism is necessarily speculative, and it should not be read as a reason to expect benefit. It is worth setting out only so that the claims made elsewhere can be seen for what they are.

The body has its own endocannabinoid system — a network of receptors and signalling molecules involved in regulating mood, the stress response, sleep and appetite. That mood is among the things this system helps regulate is why cannabinoids have been studied in depression at all. But THC and CBD act on it in different ways — THC directly on cannabinoid receptors, and responsible for the intoxicating effects; CBD more indirectly, without intoxication — and THC in particular can blunt motivation and lower mood in some people rather than lift it. If you want the underlying biology, the guides on the endocannabinoid system and THC and CBD explain it in plain terms.

A plausible-sounding mechanism is not evidence of benefit, and in depression the direction of the risk runs the other way as often as not.

What treatment involves in practice

In the uncommon situation where a specialist does consider a monitored trial — usually because a physical condition such as chronic pain is the real target, with mood as one outcome watched — treatment follows the cautious pattern used across this field: start low, increase slowly, and review often.

Unlicensed cannabis-based products are prescribed on a named-patient basis, which places responsibility for the decision and for informed consent with the specialist rather than with a manufacturer's licence. Treatment usually begins at a low dose and is titrated upwards gradually, so that any benefit and any side effects can be judged against small, deliberate changes. Most prescriptions take the form of an oil or capsule taken by mouth, or dried flower for vaporising; the two behave differently in how quickly they act and how long they last, which is covered in how cannabis-based medicines are taken and how long they take to work.

Follow-up reviews are where the specialist checks whether the treatment is actually helping, whether mood is holding steady or slipping, and whether the dose needs adjusting — or whether it should be stopped because it is not earning its place. How a dose is set and changed is explained in how a dose is decided and adjusted, and the range of unwanted effects in side effects of cannabis-based medicines.

Questions worth asking your specialist

A good assessment is a two-way conversation, and in depression an honest one may well end in a considered no. Whether or not treatment is offered, these are sensible questions to bring:

• Given my history, is a monitored trial reasonable at all — and if not, why not?
• Is my depression the target here, or a physical condition with low mood alongside it?
• Could this make my mood or motivation worse rather than better?
• How will it interact with my antidepressants and any other medicines?
• What would tell us it is not working, and when would we stop?

If a clinic is reluctant to answer these plainly, that tells you something in itself. The broader question of whether treatment fits your situation is covered in can medical cannabis treat my condition?

If you want to take this further

The useful next step is a proper assessment, not a longer reading list. Gather your diagnosis, the treatments you have already tried and what happened with each, and a current list of your 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 depression 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: 2 November 2026