Medical Cannabis and Driving: What You Need to Know

We’ve found that our medical cannabis patients often have questions about driving – Can I still drive with a prescription? Will I test positive on a drug test? What happens if I get stopped by the police? There’s a lot of uncertainty, and the rules can be confusing.

In this article, we’ll cover the basics of what you can and can’t do when it comes to driving with medical cannabis in the UK. Understanding your rights and responsibilities is key to staying safe and compliant with the law.

Can I Drive with a Medical Cannabis Prescription in the UK?

Yes, you can – but only if you’re safe to do so. UK law allows medical cannabis patients to drive as long as:

• you’re not impaired while behind the wheel.
• your medication has been prescribed by a specialist consultant, and you can provide proof if needed.
• you’re following your prescription correctly, taking it as directed by your clinician and the manufacturer.

Will I Test Positive on a Drug Test?

Most likely, yes. Roadside drug tests can’t tell the difference between medical and recreational cannabis, so even if you’re legally prescribed and not impaired, you could still test positive for THC.

This is why it’s essential to carry proof of your prescription – just in case. We recommend keeping:

• a copy of your prescription (physical or digital).
• a clinic letter from your prescriber.
• your ID to confirm the prescription belongs to you.

If you’re ever stopped by the police, having these documents handy can help avoid misunderstandings.

What Happens If I Get Stopped by the Police?

If the police stop you and conduct a drug test, let them know you have a medical cannabis prescription and show your proof.

UK law includes a medical defence, which means that as long as you’re taking your medication as prescribed and are not impaired, you’re not breaking the law. However, if the police believe you’re impaired, they may conduct further assessments, like a field sobriety test. If you are found to be impaired, you could face legal consequences.

Do I Need to Inform the DVLA About My Prescription?

Not usually. The DVLA only needs to know about medical conditions that could affect your ability to drive safely – not your prescriptions.

Some doctors suggest informing the DVLA and your insurance provider as a precaution, just in case of an accident. If you’re unsure, have a quick chat with your prescriber for guidance.

How Long Should I Wait After Taking Medical Cannabis Before Driving?

This depends on you! Everyone reacts differently, but research suggests that the effects of THC on reaction time and concentration typically last around four hours.

If you’ve just started medical cannabis or changed your dosage, it’s best to wait until you know how it affects you before driving. When in doubt, take a break from the driver’s seat.

Can I Carry Medical Cannabis in My Car?

Absolutely – but follow these simple precautions:

• Keep it in its original packaging with the pharmacy label attached.
• Store it securely, like in a glove compartment.
• Carry proof of your prescription in case you need to show it to the police.

Medical Cannabis and Road Safety

While THC can affect reaction times, studies suggest that medical cannabis patients may pose less risk than recreational users. In some cases, treating conditions like chronic pain or multiple sclerosis with medical cannabis has even improved driving ability by reducing symptoms that could otherwise make driving difficult.

That said, THC can still impair judgment and concentration, so it’s all about knowing your limits. If you’re unsure whether you’re fit to drive, it’s always best to play it safe.

Possible Future Changes to Medical Cannabis and Driving Laws

As medical cannabis use grows in the UK, there may be future updates to driving laws to better accommodate patients. More awareness and research could lead to clearer guidance and improved protections for responsible medical cannabis users.

Final Thoughts

Driving with a medical cannabis prescription is legal, but it comes with responsibility. To stay safe and avoid any issues:

• Never drive if you feel impaired.
• Carry proof of your prescription.
• Understand that roadside drug tests can’t tell the difference between medical and recreational cannabis.
• Talk to your prescriber if you’re unsure about anything.

By staying informed and prepared, you can drive with confidence while staying on the right side of the law. If you have any concerns about how your medication may affect your driving, please speak with us.

You can also check out this useful resource all about ‘Cannabis & Driving’ from the Cannabis Industry Council (CIC).

For more information about medical cannabis prescriptions, visit CB1 Medical.