Medical cannabis and employment: your rights at work

Starting medical cannabis treatment can bring real relief, but it can also raise a worry that has nothing to do with symptoms - what happens at work. Many patients wonder whether they need to tell their employer, whether they could be drug tested, and whether a legal prescription could put their job at risk.

The short answer is that plant-to-patient medical cannabis is a legitimate, prescribed medicine, and UK law gives employees real protections. But the rules are not always simple, and every workplace and every role is different. This guide sets out the general picture to help you feel more confident having these conversations. It is not legal advice, and if your situation feels complicated, it is always worth speaking to a specialist or an employment adviser.

Do I have to tell my employer I take medical cannabis?

No. In most cases, you are not legally required to tell your employer about any medication you take, including medical cannabis. Health information is personal, and employers cannot usually force you to share it.

That said, there are good reasons why disclosure is often sensible. If your role involves driving, operating machinery, or other safety-critical work, your employer may need to know so they can assess any risks and support you properly. Being open early on can also help if reasonable adjustments or drug testing come up later, since a written record of your prescription can prevent misunderstandings.

What medical information can an employer ask for?

While employers cannot demand full details of your diagnosis, they can ask general questions about your fitness for work, particularly where safety is involved. This is usually done through an occupational health assessment rather than a direct conversation with your line manager.

Employers can also ask you to confirm that you are taking a prescribed medication if it might affect your ability to do your job safely. What they cannot do is treat you unfairly, or make assumptions about your capability, simply because you use medical cannabis.

Can an employer request medical records?

An employer cannot access your medical records without your permission. Under the Data Protection Act 2018[1] [2] and related rules, your consent is needed before a doctor or clinic shares information with a third party, including an employer.

In practice, if your role requires confirmation of a prescription, you may be asked to provide a letter from your prescribing clinic. This is usually a simple, limited confirmation rather than your full medical history, and you remain in control of what is shared.

What are reasonable adjustments at work?

Under the Equality Act 2010[3] , employees with a disability are protected from discrimination, and employers have a duty to make reasonable adjustments where needed. Whether medical cannabis patients qualify depends on their underlying condition, since the law protects people with a long-term condition that has a substantial impact on daily life, rather than protecting cannabis use itself.

Where this applies, reasonable adjustments might include extra breaks to take medication, changes to shift patterns, or moving away from duties like driving or using machinery if needed. Adjustments are worked out individually, based on your role and circumstances, rather than following a fixed list.

How long does an employer have to make reasonable adjustments?

There is no single legal deadline, but employers are expected to act within a reasonable timeframe once they are aware that an adjustment may be needed. What counts as reasonable depends on the size of the organisation, the complexity of the change, and how urgent it is.

Unnecessary delay can itself become a problem, so if adjustments are dragging on, it is worth raising this in writing and, if needed, seeking advice on your options.

Can I be drug tested at work on medical cannabis?

Yes, workplace drug testing can still apply to medical cannabis patients, especially in safety-critical industries such as transport or construction. Standard tests detect THC, and this can show up even when you are not impaired, sometimes for days or weeks after use.

If you know a test is coming up, it is sensible to disclose your prescription in advance and in writing, along with a copy of your prescription or a clinic letter. A positive result linked to prescribed use should not automatically be treated as misconduct, but employers still have a duty to manage safety risks, so some roles may be reviewed or adjusted as a result.

Understanding your rights at work can make it far easier to start, and stick with, treatment. At Medicann, our process is straightforward. Our prescribing doctors take the time to understand your full circumstances, including any work-related concerns, so your treatment plan fits your everyday life. If you are considering medical cannabis and want to know more, you can check your eligibility online or get in touch with our team to speak with an approved specialist.