Cannabis and medical confidentiality in Switzerland: who can be told?

Talking to a doctor about cannabis in Switzerland: medical records, employers, insurers, authorities and the limits of confidentiality, without promises of complete anonymity.

You use CBD, consume THC in your own time or take a prescribed cannabis medicine. Before an appointment, you may wonder who will find out: your employer, your insurer or the road traffic office? A note in your medical record serves a different purpose from a certificate about fitness for work. Understanding those routes is more useful than a blanket promise that nobody else can ever receive information.

1. What to tell the doctor

Explain the product and how you use it: THC or CBD, flower, oil or edibles, approximate strength, frequency and most recent use. Include medicines, alcohol and other substances. If you do not know the amount or concentration, say so. A packaging photograph or medication list is more useful than an apparently precise dose that you cannot actually confirm.

These details may help explain symptoms, interactions and treatment risks whether or not your use is prescribed. Something you took privately can still be clinically relevant. Before a procedure, discuss changes with the responsible team. An article about privacy cannot determine whether you should stop, restart or adjust a medicine; those are individual treatment decisions, not consequences of a data-protection rule.

Discuss cannabis use before an operation

2. Confidential care is not anonymous care

Professional secrecy under Article 321 of the Swiss Criminal Code protects information learned through the professional care relationship. That can include the fact of an appointment, symptoms and patterns of substance use. A cannabis prescription is not required for medical information to receive this protection. The involvement of support staff also requires confidentiality; working at a practice does not give everyone unrestricted access to every record.

The practice must keep appropriate clinical documentation. Ask why a particular detail is recorded, who can access it and which reports are planned. Another doctor does not automatically become entitled to your information simply because they also have a duty of confidentiality. Necessary exchanges within your care team and disclosure to someone unconnected with your treatment are different situations.

3. Employers, relatives and insurers need different answers

A treatment appointment and an assessment by an employer’s independent medical examiner may have different purposes. Establish who commissioned an assessment and what it is meant to answer. An employer generally needs an assessment of fitness for work and relevant functional restrictions, rather than your entire record or automatic disclosure of a diagnosis.

Health insurance, daily sickness allowance insurance and other policies operate under different legal and contractual arrangements. Assessing a benefit claim may require medical information; that does not create unlimited access to everything you have ever discussed with a clinician. Before signing an authorisation, ask about purpose, recipients, time period and scope. Paying privately does not by itself remove documentation requirements or applicable statutory disclosure duties.

Questions for each information recipient

Cannabis, employers and occupational health assessments

4. Consent, reporting provisions and release from secrecy

Disclosure may be based on your informed consent. Legislation can also establish a right or a duty to report particular circumstances: a permission and an obligation are not interchangeable. In certain situations, the responsible cantonal authority may authorise release from professional secrecy. The basis must be assessed for the specific facts; a general explanation about cannabis cannot guarantee the outcome of an individual case.

For driving, Article 15d of the Road Traffic Act is particularly relevant. It provides a reporting right for doctors in connection with medical fitness to drive. Saying that you use cannabis does not automatically mean a report will follow. Equally, promising that the road traffic office can never receive information would go too far. Longer-term medical fitness, ability to drive at a particular moment and criminal-law questions about consumption are separate assessments. Ask what specific medical concern is being raised.

Separate current driving ability from medical fitness to drive

5. Prescriptions, MeCanna and club accounts

Cannabis medicines may fall within the statutory accompanying data collection through MeCanna. The Federal Office of Public Health describes coded storage, which is different from complete anonymity. Exceptions depend on the preparation and its use. Ask the prescriber whether your treatment falls within the reporting requirement, what is collected and how coding works. This treatment-related collection should not be confused with a criminal complaint.

Club membership and participation in an authorised trial have their own data processes. A club account is not automatically protected by medical professional secrecy just because it concerns cannabis. Read the relevant privacy notice and, for a study, the participant information. A prescription, admission to a trial and registration with CannabisClub.ch have different conditions and effects; none is a substitute for the others.

Understand medical cannabis treatment and accompanying data collection

Check the privacy arrangements for club membership

6. Prepare questions as well as information

You can be open about your use while asking how the information will be handled. Before signing a broad release, request an understandable explanation of what will be shared and why. The aim is not to deprive the care team of relevant facts, but to understand disclosure that is proportionate to a stated purpose.

After an assessment for an employer or insurer, note which report is intended for which recipient and consider requesting a copy. Acute symptoms or an emergency should not be left untreated because of worries about data sharing. Tell the clinical team truthfully what you took; legal and privacy questions can then be examined using the actual circumstances rather than assumptions.

• Note the product, frequency and most recent use.
• List medicines and other substances honestly.
• Clarify the medical examiner’s role and instructions.
• Ask about a report’s purpose and recipient.
• Understand the scope of consent before signing.
• For prescribed treatment, ask about records and MeCanna.

One way to start the conversation

I want to discuss my cannabis use openly so that my care can be planned safely. Could you explain what you will record, who will receive a report and which information is necessary for that purpose?

7. If you suspect an unjustified disclosure

Start with the responsible practice or institution. Explain which information you believe was sent, to whom, and what you want clarified. Ask about the purpose, scope and basis. You can request access to your information and records, subject to legal restrictions and retention obligations. A general deletion request does not automatically override the need to preserve clinical documentation.

Keep relevant letters and consent forms. Depending on the institution and issue, patient advice services, the responsible data-protection or health supervisory authority, or independent legal advice may help. Public institutions may operate under a different data-protection framework from private practices. This guide does not establish whether a particular disclosure was lawful or whether an individual breach has occurred.

Changing treating clinician is easier to organise with a clear set of relevant records. Gather records for a new treating clinician

Editorial review date: 2 November 2026. Framework: professional secrecy, data-protection law and specific reporting provisions. General information, not individual medical or legal advice. This guide is for adults; capacity of judgement, representation and protective provisions require separate consideration for minors.