Medical cannabis and work — what UK patients need to know

Why this matters now

Releaf’s own Releaf Protect service data says employment was the largest category of calls during the first four months of 2026: 33 of 114 calls, or 29%. Criminal-litigation calls were 23% and driving-related calls were 22%. Employment calls averaged 16.3 minutes, the longest category in that dataset.

The reported employment questions included contracts, disciplinary processes, sick pay and concerns that may engage the Equality Act 2010. This is useful evidence of the kinds of problems reaching one provider’s legal-support service, but it is not a national prevalence study and GreenGuruAI does not present 29% as the proportion of all UK medical-cannabis patients who experience workplace problems.

Start with what is happening now

The best next step depends on the situation. Choose the closest starting point rather than treating every workplace concern as the same legal question.

1. I am starting a job or completing onboarding. Read the medicines, health-and-safety and drug-testing policies before answering. Use the confidential route provided for prescribed medication and ask who will see the information.
2. I already work here and nothing has happened yet. Check whether the role is safety-critical, whether treatment affects any duty and whether the policy or contract requires prescribed medicines to be declared.
3. A workplace test has been announced. Follow the declared-medicines process, keep current prescription and pharmacy-labelled evidence available and ask what happens after an initial non-negative result.
4. I have received a positive or non-negative result. Ask for the result, confirmation status, relevant policy and review process in writing. Separate lawful prescribed use, the analytical result and any claimed impairment or safety concern.
5. I am facing restriction, suspension or disciplinary action. Ask what specific policy, conduct, capability or safety issue is relied on, request occupational-health input where relevant and obtain support from a union, Acas or an employment solicitor.

The legal foundation in Great Britain

Disability discrimination and reasonable adjustments

Section 6 of the Equality Act 2010 defines disability by reference to a physical or mental impairment with a substantial and long-term adverse effect on normal day-to-day activities. A medical-cannabis prescription does not itself make someone disabled; the underlying condition and its effects determine whether the statutory definition is met.

Where disability law applies, employers must not discriminate because of disability and may have a duty to make reasonable adjustments. Depending on the individual disadvantage and the role, discussion could include working hours, breaks, treatment time, temporary duty changes, equipment, work location or a role-specific safety plan. An adjustment is not automatic simply because it is requested: what is reasonable depends on the circumstances.

Health and safety

The Health and Safety at Work etc. Act 1974 places duties on employers and employees. HSE states that employees must take reasonable care of themselves and anyone who could be affected by their work. That is particularly important in safety-critical work involving driving, machinery, electrical equipment, heights or other tasks where impairment could create serious risk.

Do not drive, operate machinery or carry out hazardous work while impaired. A valid prescription does not remove this responsibility.

Health data and drug-testing information

ICO guidance treats workers’ health information, including drug-test results, as health data and therefore special-category personal data. Employers need a lawful basis and an appropriate special-category condition, must be transparent about why testing is used, should minimise the information collected and must keep retained health information secure and confidential.

The ICO also says drug testing should be directed at a justified workplace purpose, normally safety, rather than merely revealing private drug use. It encourages employers to consider whether a test provides useful evidence of impairment or potential impairment and whether a less intrusive approach would meet the same objective.

Disciplinary and grievance process

A valid prescription does not automatically block disciplinary action. The Acas Code says employers should establish the facts, tell the employee the basis of the problem, allow them to put their case before a decision is made, act consistently, permit an appeal and allow accompaniment at formal disciplinary or qualifying grievance meetings.

That means a positive or non-negative test should not be treated as if it answers every employment question by itself. The employer still needs to consider the policy, the evidence, lawful prescribed use, the role, any actual safety or conduct concern and the employee’s explanation. A test result and workplace impairment are not the same question.

Does a prescription automatically protect me at work?

No. A prescription is important evidence that the medicine was lawfully prescribed, but it does not create an unrestricted right to use it anywhere, ignore a workplace policy, perform safety-critical work while affected or receive one particular adjustment.

Equally, prescribed use should not automatically be treated as illegal drug misuse. A sensible workplace process should establish what medicine is prescribed, whether work is affected, what the role requires and whether support or risk controls are needed.

Do I have to tell my employer?

There is no general rule requiring every employee to disclose every prescription before starting a job. But that is not the same as saying disclosure can never be required or sensible. Check your contract, staff handbook, medicines policy, drug-and-alcohol policy and any rules applying to driving, machinery, regulated duties, lone working, security or other safety-critical work.

HSE guidance says workers should take reasonable care of themselves and others. If treatment or side effects could make a duty unsafe, do not conceal that safety issue. If you need a reasonable adjustment, the employer will normally need enough information to understand the disadvantage and the support being requested.

Can an employer test for cannabis?

Some employers use testing, particularly in safety-critical settings. HSE says employees must consent to screening for practical and legal reasons, although refusing where an employer has good grounds for testing may have employment consequences. Screening should form part of an overall policy and testing procedures should be reliable.

Before testing, follow the declared-medicines process and keep current prescription and dispensing evidence available. Ask what the test is designed to establish, whether confirmatory analysis is used, how prescribed medicines are handled and what policy governs the consequences.

Open the full workplace drug-testing guide →

If a test or disciplinary issue starts

• ask for the relevant policy, allegation and test result or confirmation status in writing;
• explain that the result may relate to prescribed medication and provide focused evidence such as the prescription or pharmacy-labelled packaging where relevant;
• ask the employer to distinguish analytical detection from an allegation of impairment, misconduct or unsafe performance;
• raise disability and reasonable-adjustment issues where the underlying condition may qualify;
• ask about occupational-health input where functional safety or capability is disputed;
• make a reasonable request to be accompanied by an eligible colleague or trade-union representative at a formal disciplinary meeting where the statutory right applies;
• record deadlines for any response, grievance or appeal.

Northern Ireland is different

The Equality Act 2010 does not apply to Northern Ireland. Disability discrimination and reasonable-adjustment duties are instead governed principally by Northern Ireland legislation including the Disability Discrimination Act 1995, and the Equality Commission for Northern Ireland provides official employment guidance.

Workplace health-and-safety duties also sit under Northern Ireland legislation, including the Health and Safety at Work (Northern Ireland) Order 1978. HSENI states that employees must take reasonable care of their own and other people’s health and safety.

If the workplace is in Northern Ireland, use the Equality Commission for Northern Ireland and HSENI sources below rather than assuming a Great Britain process or statutory provision applies unchanged.

Record these facts before the conversation

• the exact policy or contract wording;
• whether the role includes driving, machinery, public safety or another safety-critical duty;
• the date, reason and type of any test;
• whether the medicine was declared and through which confidential route;
• the wording of any result, restriction, suspension or disciplinary allegation;
• the deadline for responding, appealing or raising a grievance.

Keep records factual. Do not include unrelated medical details in emails or forms unless they are genuinely required.

Where to get direct help

• Acas — Great Britain: free, impartial workplace advice on employment rights, disciplinary processes and disputes. Helpline: 0300 123 1100.
• Citizens Advice — England: Adviceline 0800 144 8848. Wales: Advicelink 0800 702 2020. In Scotland, use Citizens Advice Scotland to find the appropriate local advice service.
• Equality Advisory Support Service — England, Scotland and Wales: discrimination and human-rights advice. Helpline: 0808 800 0082.
• Northern Ireland: the Equality Commission for Northern Ireland provides free, confidential discrimination advice; HSENI provides workplace health-and-safety guidance.
• Releaf Protect: a 24/7 legal-guidance service provided with Irwin Mitchell for eligible active Releaf+ members after the qualifying period. It is not a free helpline open to all UK medical-cannabis patients and does not provide guaranteed ongoing representation.