Medical Cannabis for Epilepsy in the UK

Epilepsy is the condition with the most direct NHS pathway for a cannabis-based medicine in the UK. Epidyolex, a purified CBD oral solution, is approved by NICE for use in certain rare childhood epilepsy syndromes. For adults and children with treatment-resistant epilepsy not covered by this approval, private specialist prescribing may be considered.

What is Epilepsy?

Epilepsy is a neurological condition characterised by recurrent, unprovoked seizures — episodes of abnormal electrical activity in the brain. It is one of the most common serious neurological conditions in the UK, affecting people of all ages. Seizures vary considerably in type and severity: focal seizures originate in one part of the brain, while generalised seizures involve widespread electrical disruption.

Approximately a third of people with epilepsy continue to experience seizures despite trying multiple anti-seizure medications — termed drug-resistant or refractory epilepsy. Refractory epilepsy is associated with higher injury risk, social stigma, reduced independence, and in some cases increased risk of sudden unexpected death in epilepsy (SUDEP).

Medical Cannabis and Epilepsy — What Does the Evidence Say?

Epilepsy has the strongest and most direct evidence base for cannabis-based medicines among all conditions currently treated in the UK. Epidyolex — a pharmaceutical-grade, purified CBD solution — was developed following compelling clinical trial data demonstrating significant reductions in seizure frequency in Dravet syndrome and Lennox-Gastaut syndrome. NICE has recommended Epidyolex as a treatment option for these conditions when used alongside the anti-seizure medication clobazam.

Beyond Epidyolex, clinical literature on cannabis-based medicines and epilepsy includes observational data from the UK's own Early Access to Medicines Scheme (EAMS) and international programmes. This data suggests that some patients with other forms of refractory epilepsy may experience reductions in seizure frequency with CBD-dominant or balanced cannabis products.

Who Qualifies for a Medical Cannabis Prescription for Epilepsy?

• Epidyolex (NHS pathway): Children and young people with Dravet syndrome or Lennox-Gastaut syndrome being treated with clobazam who have not responded adequately to other anti-seizure medications.
• Other cannabis-based medicines (private pathway): Patients with other forms of drug-resistant epilepsy who have tried at least two appropriate anti-seizure medications without adequate seizure control.
• Specialist involvement: A neurologist or paediatric neurologist must be involved in prescribing decisions for epilepsy.

What to Expect from a Medical Cannabis Consultation for Epilepsy

Consultations for epilepsy-related cannabis prescribing are particularly detailed. The specialist will review your full seizure history — types, frequency, duration, triggers — alongside your complete anti-seizure medication history. The prescriber will assess for genuine treatment resistance and potential drug interactions (CBD is known to affect serum levels of certain anti-epileptic drugs). Dosing is titrated slowly with regular monitoring of seizure frequency and tolerability.

How Much Does Medical Cannabis Cost for Epilepsy in the UK?

• Epidyolex via NHS: For eligible Dravet or Lennox-Gastaut patients, Epidyolex may be NHS-funded following NICE guidance, subject to local commissioning decisions.
• Private initial consultation: £50 to £150.
• Monthly medication (private): £150 to £400 per month.
• Follow-up appointments: £30 to £75 per session.

Frequently Asked Questions — Medical Cannabis for Epilepsy UK

Is Epidyolex the same as medical cannabis?

Epidyolex is a pharmaceutical-grade, purified CBD oral solution derived from cannabis. It contains no THC and holds a formal marketing authorisation following clinical trials in Dravet and Lennox-Gastaut syndromes.

Can adults with epilepsy access cannabis-based medicines on the NHS?

Adult NHS prescribing for epilepsy outside the Epidyolex licence remains very rare. Adults with treatment-resistant epilepsy currently find private specialist prescribing more accessible.

Could cannabis-based medicines interact with my existing anti-seizure medications?

Yes — CBD is known to affect blood levels of certain anti-epileptic drugs, notably clobazam and valproate. Your specialist will account for these interactions and may recommend monitoring of drug levels.

Are there THC-containing cannabis medicines for epilepsy?

Most epilepsy prescribing focuses on CBD-dominant products. THC is generally avoided in epilepsy due to its potential to lower the seizure threshold in some individuals.

What if cannabis-based medicines do not reduce my seizures?

Your specialist will assess clinical benefit at defined intervals — typically after two to four months — and will discontinue treatment if there is no meaningful response.