If you’ve had an interest in joining a clinical trial—or recently joined one—you’ve likely had several thoughts running through your mind, like “How long will this trial take?” “What if I change my mind?” “What if I have side effects?” “Can I leave the trial at any time?” and, if you do, “Will I get in trouble?” While these concerns are completely normal, it’s important to know this: you can leave a clinical trial at any time.
Yes, you can leave a clinical trial at any time. Clinical trials are voluntary, and you have the right to withdraw for any reason without losing access to your regular medical care. This protection is built into the informed consent process, which ensures participants understand their rights before joining a study. Knowing you can withdraw safely and without penalty can help you make decisions with confidence.
“Participation in a clinical trial is completely voluntary, and participants can leave at any time for any reason,” says Joyce H.N.Nortey, MPH, MSBH, Sr. Director, Clinical Research & Operations at Evidation Health and Research Advisor for the Fibroid Foundation. “That’s not just a courtesy—it’s a legal and ethical requirement protected by federal regulations, Good Clinical Practice guidelines, and Institutional Review Board oversight. Autonomy comes first.”
If you decide to leave a clinical study early, there are a few practical steps that typically follow.
No. You are not required to explain your decision. Researchers may ask whether you’re willing to share your reason, as this information can help improve safety and future studies. However, answering is completely optional.
No. Your regular medical care will continue as usual. Clinical trials operate separately from your standard healthcare, and your primary care provider can continue managing your treatment.
If you were receiving a study drug, therapy, or other intervention, it will usually stop once you withdraw. Your doctor or research team may help transition you to a standard treatment appropriate for your condition. “The priority is always safety,” says Nortey. “These visits help ensure there are no unresolved side effects and allow for a safe transition back to standard medical care.”
In most cases, researchers may continue using the data collected before you withdrew. This helps ensure the study remains accurate and safe. However, no new information will be collected after you leave without your permission.
Leaving a clinical trial early is more common than many people realize, and it does not mean you’ve done anything wrong. “People leave clinical trials for many valid reasons, including side effects, life changes, or simply deciding it’s no longer the right fit,” says Nortey. “Participants should never feel guilty for prioritizing their health, comfort, or personal circumstances.” Participants withdraw for many different reasons, including:
“Life circumstances change, and participants always have the right to reassess whether a clinical trial still fits their needs,” says Nortey. “Withdrawing is a personal health decision, and participants should feel empowered to make the choice that’s best for them.”
While you can leave a clinical trial at any time, there are some safety considerations. Certain medications should not be stopped suddenly without medical supervision. In these cases, your study team may recommend gradually reducing the medication or attending a final safety visit to monitor your health. These recommendations are meant to protect your safety—not prevent you from leaving. You still have the right to withdraw at any time.
If you’ve decided a clinical trial is no longer right for you, taking a few steps can help ensure a smooth transition:
Open communication with your care team helps protect your health while honoring your decision.
Federal regulations and ethical oversight protect clinical trial participants. Institutional Review Boards (IRBs) review research studies to ensure participants are treated safely, ethically, and respectfully. Clinical trials in the United States are also governed by federal regulations known as the Common Rule and by ethical principles outlined in the Belmont Report, which emphasize respect for participants, safety, and informed consent.
“Institutional Review Boards exist specifically to protect participants’ rights and welfare,” explains Nortey. Your participation is voluntary from beginning to end, and your decision to leave must be respected. “Participants have the right to withdraw at any time, and that decision must always be respected without pressure,” says Nortey.
For many patients—especially Black Americans—historical medical mistreatment has contributed to mistrust in research. Today, clinical trials must adhere to strict ethical protections to safeguard participants and ensure transparency throughout the process.
While clinical trials play an important role in advancing medicine and improving treatments, ultimately, your health, comfort, and peace of mind always come first. If you’re feeling unsure about leaving a clinical trial, “that’s completely normal,” says Nortey. “Start by having a conversation with the research team. You can tell them you’re considering withdrawing and want to understand what that would mean. That doesn’t commit you to staying—it simply gives you clarity.”
Nortey also recommends involving your primary care doctor, specialist, or a trusted loved one to help you make a decision that aligns with your health and overall well-being. The goal is always to support your health and your decision. ”Understanding your rights helps you make informed decisions and reminds you that you remain in control of your healthcare journey.”
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