Legal & safety

Medical Disclaimer

ONCE center, established in Amsterdam, Netherlands (“we”, “us”, “our”) provides this website and its preliminary assessment for educational purposes only. This disclaimer forms part of our Terms of Use and should be read together with our Privacy Policy. By using this website you accept the limitations described below.

No Medical Advice

The information on this website is educational. It does not provide a diagnosis, does not constitute medical advice, and does not establish a clinician–patient relationship.

Scope of the Preliminary Assessment

The preliminary assessment helps organise the information you choose to share and indicates what a clinician would need to review. It:

  • cannot diagnose a condition;
  • cannot confirm that a psilocybin-assisted pathway is appropriate for you;
  • cannot replace professional screening by a qualified clinician.

Information you submit is handled as described in our Privacy Policy, including the sections on health data, consent and retention.

Eligibility & Risk

A psilocybin-assisted pathway is not appropriate for everyone. Individual risks, medical and psychiatric history, medication, and current circumstances all matter, and some of them make proceeding unsafe. Our services are intended for adults (18+) only.

Medication

Never stop, reduce, or change prescribed medication on the basis of anything on this website. Medication changes must only be discussed with the professional who prescribes it.

Not an Emergency Service

ONCE is not an emergency service and does not replace ongoing medical or mental-health care. If you are facing an immediate safety concern, contact your local emergency services or a local crisis support service without delay.

Contact

Questions about this disclaimer can be sent to care@once.be.

Changes to This Disclaimer

We may update this disclaimer from time to time. When we do, we’ll post the new version with a revised “Last updated” date. Continued use of this website after changes constitutes acceptance of the updated disclaimer.

Last updated: September 2026