Medical cannabis on prescription: what the law allows, and why the NHS door is so narrow

Field Notes

By Trevor, founder of Privacy Architect

I found a way to obtain what the NHS refused to supply.

A prescription for cannabis is legal in the UK. That sentence surprises people, partly because for most of our lives it wasn’t true, and partly because the legal route is narrow enough that plenty of people never find it. This piece sets out what the law actually says, who is allowed to write the prescription, and what happens if you’re stopped while carrying it. It doesn’t offer medical advice — that belongs to your specialist, not to us.

The law changed on 1 November 2018

Before that date, cannabis, cannabis resin, cannabinol and its derivatives were listed in Schedule 1 of the Misuse of Drugs Regulations 2001. Schedule 1 is the tightest shelf. Treatment with a Schedule 1 drug needed a licence or other authority from the Home Office.

The government’s own explanatory notes to the 2018 regulations describe what happened next. A defined category — “cannabis-based products for medicinal use in humans” — was moved out of Schedule 1 and into Schedule 2, where it can be prescribed. The notes record that the change followed a review by the government’s Chief Medical Adviser, published on 3 July 2018, which found conclusive evidence of therapeutic benefit for some conditions, and advice from the Advisory Council on the Misuse of Drugs.

So the legal doorway has been open for eight years. What people usually mean when they say “the NHS won’t prescribe it” is something narrower, and it’s worth separating the two.

Who the law lets write the prescription

The detail sits in regulation 16A, inserted into the 2001 Regulations by the same 2018 instrument. It provides that nobody may order a cannabis-based product for medicinal use in humans unless it is a special medicinal product, not also an investigational medicinal product, for use in accordance with a specialist medical practitioner’s prescription or direction; or an investigational medicinal product without a marketing authorisation, for use in a clinical trial; or a product that holds a marketing authorisation.

“Specialist medical practitioner” is a formal term, not a compliment. The regulation defines it by reference to section 34D of the Medical Act 1983 — a doctor on the General Medical Council’s Specialist Register.

Two things follow. The test is the prescriber’s registration, not their employer: nothing in the regulation turns on whether the prescription is NHS or private. And a GP working in an ordinary surgery is not, in that capacity, the person the regulation is describing.

What the NHS will and won't do

The NHS page on medical cannabis is unusually blunt, and worth reading in its own words. Very few people in England are likely to get an NHS prescription for medical cannabis, it says, and cannabis-based medicine can only be prescribed on the NHS by a specialist hospital doctor, or under a specialist’s supervision.

It sets out who is likely to benefit — a very small number of patients: children and adults with rare, severe forms of epilepsy; adults with vomiting or nausea caused by chemotherapy; and people with muscle stiffness and spasms caused by multiple sclerosis.

Then there is pain, which is where most people’s interest lies. The NHS says there is some evidence that medical cannabis can help certain types of pain, but that the evidence is not yet strong enough to recommend it for pain relief, and that in some cases it may be prescribed for pain as part of a clinical trial.

That is the honest position rather than a closed door, but it is a long way from “ask your GP”.

Where private clinics fit

If the law permits a specialist to prescribe, and the NHS has restricted its own prescribing to a small set of conditions and settings, then a specialist working outside the NHS is the route left open by the same regulation. That is why the private clinic exists as a lawful option rather than a loophole.

What we can’t tell you is what it costs. Fees vary, we couldn’t verify figures we’d be willing to stand behind, and we’d rather say so than print a number that turns out to be wrong. If cost is the deciding factor for you, ask the clinic for its full fee schedule in writing before you book anything.

The licensed medicines are a separate matter

Two cannabis-related medicines come up by name here. Nabilone is prescribed to adults for nausea and vomiting caused by chemotherapy, when other treatments have not helped. Nabiximols — sold as Sativex — is licensed in the UK for adults with multiple sclerosis-related muscle spasticity that has not improved with other treatments. A licensed medicine is a different thing from a prescribed cannabis product, and the rules around them differ. It is worth knowing which one your prescription actually is.

Carrying it, and proving it

A prescription is only useful if it survives contact with a police officer, a border official or an employer who doesn’t know the law. The NHS suggests carrying ID that matches the details on the dispensing label and the prescription, or the doctor’s letter. A photo driving licence or a proof-of-age card is the sort of thing that will do.

Different rules apply to travel abroad, and we haven’t verified those for this piece — check before you book, not at the airport.

One thing the law forbids outright

Regulation 16A is explicit: a person must not self-administer a cannabis-based product for medicinal use by smoking it, other than for research purposes. The route that is regulated is not the route of a joint. If you take a prescribed product, take it as prescribed.

The shadow the law leaves

The Misuse of Drugs Act 1971 still says what it always said. Section 5 makes it not lawful to have a controlled drug in your possession — but that subsection is expressly “subject to any regulations under section 7”, and having one in possession in contravention of it is an offence. Those are the words the medical route actually hangs on. The 2001 Regulations are made under powers in the same Act, so the exception sits inside the Act’s own scheme rather than being bolted on from outside it.

This is where the doubt comes from, and it is worth naming plainly. A legal prescription is an exception to a general prohibition, and an exception can be a thin thing to hold in a car park, on a ward, or across a kitchen table. The doubt is not imaginary. The NHS page says in as many words that possessing cannabis is illegal whatever you are using it for, and that this includes medical cannabis products unless they have been prescribed for you.

We looked for a UK source that measures that experience, and we didn’t find one we could cite properly, so we’re not going to quote a figure. What we can say is that the caution is not imaginary: the NHS page warns that cannabis-based products sold over the internet without a prescription are likely to be illegal and may contain THC, which is one reason a lawful prescription can still meet a doubtful look.

If you want to take this further

Start with your specialist, or your GP, and ask directly which of the categories above you fall into. If you have been refused NHS treatment, ask for the reason in writing — that is the document any later conversation will turn on. We don’t give legal advice here, and we won’t pretend a web page can replace a doctor who has read your notes.

One small caution about the NHS page itself: it was last reviewed on 27 May 2022, and it names 27 May 2025 as its own next review date. That date has now passed, and at the time we checked, the page still carried the 2022 review — so the summary may be running behind the law. Read regulation 16A itself alongside the page, and ask your specialist which route you fall under.

I’m a 53-year-old man who lives with pain when I wake and when I’m asleep, and there is no escape. My pain doesn’t fit a scale of 1 to 10 anymore; most days it sits at about 16 out of 10. Cannabis, for me, was a life changer.

Sources

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