Can I leave a clinical trial after joining?

Yes. Taking part in a clinical trial is voluntary, and you can withdraw at any time, at any stage of the study, without giving a reason. This right is a cornerstone of research ethics and it is written into the consent form you sign before joining.

Leaving a trial will not affect your usual medical care. Your doctors will continue to treat you, and you will still have access to the standard treatments available for your condition. Research teams understand that circumstances change and people withdraw for all sorts of reasons.

If you are thinking about leaving, it is worth telling the research team rather than simply stopping. Some study treatments should not be stopped abruptly for safety reasons, and the team can advise on the safest way to withdraw. They may also ask if you are willing to attend a final visit so your health can be checked.

You can also choose what happens next. You might withdraw from the treatment but agree to continue follow-up visits, or stop all participation entirely. Data already collected about you is usually kept in the study records because removing it can affect the reliability of the research, but no new information will be collected once you withdraw.

The informed consent process covers all of this before you join, so you know your options from the start. If anything about withdrawing is unclear, ask the research team to explain it in plain language, and take time to discuss the decision with your doctor or family if that helps.