Driving and Medical Cannabis

Key Takeaways

• UK patients prescribed medical cannabis have a statutory medical defence against drug-driving charges

• The defence requires: (a) the medication was prescribed, (b) taken as directed, and (c) you are not impaired

• Patients should carry evidence of their prescription when driving (Releaf medical cannabis card can help)

• The DVLA requires notification of certain medical conditions but not all prescriptions — consult your specialist

• Even with a valid prescription, driving while impaired remains a criminal offence

Can You Drive with a Medical Cannabis Prescription?

Yes — UK law provides a statutory medical defence for patients taking prescribed controlled substances, including medical cannabis. This means that even if a roadside test detects THC above the standard limit (2µg/L), a patient with a valid prescription can raise the medical defence, provided they were not impaired and were taking the medication as prescribed.

However, if a patient is unfit to drive due to the effects of their medication — regardless of it being prescribed — they can still be charged with drug-driving. Patients should never drive if they feel impaired.

Carrying Proof of Prescription

If stopped by the police, having documentation of your prescription readily available can help resolve the situation quickly. Many Releaf patients carry their medical cannabis card, which provides quick verification of prescription status. Releaf Protect also provides access to legal advice from Irwin Mitchell for eligible Releaf+ patients.

For comprehensive guidance on the law, DVLA rules, and practical advice for patients, see: Medical Cannabis, the DVLA and Prescribed Medicines.

Further Reading

• Medical Cannabis, the DVLA and Prescribed Medicines — comprehensive guide to driving law and medical cannabis

• Cannabis Driving Laws in the UK — detailed legal explainer

• Medical cannabis card — proof of prescription for roadside situations

• Releaf Protect — legal helpline for Releaf+ patients