Is Medical Cannabis Actually Legal in the UK? The Law Explained

Ask ten people whether medical cannabis is legal in the UK and you'll get ten different answers, several of them confidently wrong. Here's what the law actually says.

What changed in November 2018

Following high-profile cases involving children with severe treatment-resistant epilepsy, the government rescheduled cannabis-based medicines. From 1 November 2018, regulations amending the Misuse of Drugs Regulations 2001 moved cannabis-based products for medicinal use into Schedule 2 — the schedule for controlled drugs that can be lawfully prescribed, supplied and possessed, alongside medicines like morphine.

Three things define what qualifies as a CBPM and who can access it:

1. It must meet the legal definition — a product that is or contains cannabis (or derivatives), produced for medicinal use in humans, and regulated as a medicinal product or an ingredient of one.
2. Only a specialist doctor can initiate the prescription — a doctor on the General Medical Council's Specialist Register, prescribing within their specialty. GPs cannot initiate CBPM prescriptions (though shared-care arrangements exist for continuation in some cases).
3. Everything runs through the controlled-drugs machinery — Schedule 2 prescription requirements, licensed wholesale distribution, pharmacy dispensing and record-keeping. This is a tightly regulated pharmaceutical supply chain, not a dispensary model.

If you hold a valid prescription and your medicine was dispensed through that chain, your possession and use are lawful throughout the UK.

Licensed medicines vs "specials"

Within legal medical cannabis there's a distinction worth understanding, because it explains a lot about access and cost:

Licensed cannabis-based medicines have marketing authorisations after full clinical trials — Epidyolex (cannabidiol, for specific severe epilepsies), Sativex (nabiximols, for MS spasticity) and nabilone (chemotherapy-related nausea). These are the products NICE has assessed and, for specific indications, recommended — and therefore the ones with an NHS route.

Unlicensed CBPMs — the oils and flower most private patients receive — are prescribed as "specials": unlicensed medicines a specialist can prescribe for an individual patient where clinically appropriate. Lawful, quality-regulated, but without marketing authorisations, which is central to why the NHS rarely funds them.

Why "legal" doesn't mean "on the NHS"

This is the single biggest source of public confusion. NHS prescribing of CBPMs is confined to a narrow set of circumstances shaped by NICE guidance and specialist commissioning — in practice, a small number of patients, mostly within the licensed-product indications. The overwhelming majority of the UK's tens of thousands of patients are prescribed privately, paying for consultations and medication themselves.

So both of these statements are true, and people talk past each other constantly:

• "Medical cannabis is legal in the UK" — yes, since 2018.
• "You basically can't get it on the NHS" — also, for most conditions, yes.

What's still illegal

The 2018 change was surgical, not general:

• Recreational cannabis remains a Class B controlled drug — possession carries up to 5 years' imprisonment, supply and production up to 14.
• Self-medication isn't medical use in law. Cannabis bought outside the prescription system is illicit regardless of your reasons or diagnosis — legally, a genuine health need changes nothing about possession of unprescribed cannabis.
• Growing your own remains production, prescription or not.
• Sharing prescribed medication with anyone else is unlawful supply.
• High-street CBD is a different regime entirely — consumer CBD products aren't CBPMs, aren't prescribed, and sit under food and consumer law with their own THC restrictions.

What lawful patient status means day to day

Holding a valid prescription makes you a patient taking a controlled medicine — with the same texture that has for any Schedule 2 drug, plus some cannabis-specific friction. You can possess and use your medicine; you should keep it in its original labelled packaging with your prescription evidence available; police can lawfully ask you to verify your status and documentation resolves most encounters. From there the practical questions begin — driving, insurance, work and travel — which is what the rest of this site covers.