Clinical trial insurance: patient rights to compensation

What costs does the sponsor cover during a clinical trial?

The sponsor — the entity responsible for organising, running and financing the trial — covers the cost of the investigational product itself. The sponsor also pays for the medical care that the trial protocol requires, including the specialised tests used to check whether you qualify for the study. Treatment of certain adverse reactions linked to the trial is covered as well^[1]. This principle exists because participants are asked to accept a degree of uncertainty and inconvenience for the sake of research.

You also have the right to be reimbursed for expenses you can document, such as travel costs to the study site^[1]. Ask the investigator or study coordinator before you start what exactly is reimbursed and what receipts or documents you need to keep. Trial budgets and sponsor policies differ from study to study, so it is worth asking early rather than assuming coverage matches what you might expect^[2].

What can you claim if you are injured because of the trial?

If you suffer permanent damage to your health because of the investigational product or a medical procedure required by the trial protocol, you have the right to seek compensation. This right exists alongside the sponsor's obligation to cover treatment-related costs described above^[1].

An informed consent document that you sign before joining a trial should already describe any costs and any compensation arrangements, alongside the risks and benefits of the study. Take the time to read this section carefully, and ask the research team to explain anything that is unclear before you sign^[2].

What is the Clinical Trials Compensation Fund?

The Compensation Fund provides financial support to a clinical trial participant who has suffered an injury as a result of taking part in the trial. Applications are submitted to the Patient Ombudsman^[1].

Claims are granted for injury suffered as a result of participation in clinical trials that began after 14 April 2023. Detailed information about the fund and how to apply is published on the Patient Ombudsman's website^[1].

How do compensation arrangements differ between Phase I and later-phase trials?

In the United Kingdom, industry compensation guidelines historically distinguished between healthy volunteers in Phase I studies, who have no target disease and no realistic prospect of personal benefit, and patient volunteers in Phases II–IV, who do have a prospect of benefit from the treatment under study. Guidelines effective from 1 January 2015 removed this distinction for Phase I patients who have the target disease but no reasonable prospect of direct benefit, so that they are treated the same as healthy volunteers for compensation purposes. The rationale behind this change was to acknowledge that a patient enrolled in an early-phase study primarily to help generate safety data, rather than for personal therapeutic gain, faces a risk profile closer to that of a healthy volunteer than to that of a later-phase patient who might reasonably expect the treatment to help their condition^[3].

Under these guidelines, member companies sponsoring Phase I studies that offer no prospect of direct therapeutic benefit must create a legally binding obligation, set out in the consent form and subject information, to pay compensation to the volunteer if they are injured because of participation. Oncology or other Phase I studies where side effects are foreseeable but patients may reasonably expect therapeutic benefit are not covered by this specific change. This distinction matters in practice: two participants enrolled in trials that sound similar on paper — both early-phase, both involving an unapproved medicine — may in fact fall under different compensation categories, depending on whether the study population has the target disease and a realistic chance of benefiting^[3].

For comparison, this UK industry framework illustrates one national approach to trial compensation; ask the study team which compensation arrangements apply in your specific trial and country, since these details must be included in your informed consent information^[2]. National systems can differ considerably in how they define eligibility, who administers claims, and what evidence is required. Relying on general assumptions about "how compensation works," without checking your own trial's documentation, could leave you unprepared if something does go wrong^[4].

Type of cost or harm	Who is responsible	Where it is described
Investigational product	Sponsor	Charter of rights and obligations of a clinical trial participant[1]
Trial-related medical care and qualification tests	Sponsor	Charter of rights and obligations of a clinical trial participant[1]
Treatment of certain adverse reactions	Sponsor	Charter of rights and obligations of a clinical trial participant[1]
Documented expenses (e.g., travel)	Reimbursed to the participant	Charter of rights and obligations of a clinical trial participant[1]
Permanent damage to health from the investigational product or required procedure	Compensation claim; Compensation Fund for trials starting after 14 April 2023	Charter of rights and obligations of a clinical trial participant[1]
Phase I injury, no prospect of direct benefit (UK industry guidance)	Legally binding sponsor obligation set out in the consent form	ABPI Clinical Trial Compensation Guidelines[3]

What must you report to the investigator, and when?

You have the right to contact the principal investigator, ask questions and report any noticeable changes in your well-being. It is your responsibility to inform the investigator about your current state of health and about any side effects, including any changes in health you notice^[1]. This is not simply a courtesy: prompt reporting is part of how the trial team keeps you safe, since a symptom that seems minor to you may be an early sign of a reaction the research team needs to assess quickly^[5].

• Report a new symptom or any change in your health as soon as you notice it^[5].
• Tell the research team if you start taking a new medicine or receive any other medical treatment while enrolled^[5].
• Follow the investigator's recommendations and the appointment schedule described in the trial information^[1].
• If you need to change or cancel a scheduled visit, tell the investigator or the study centre in advance where possible^[1].

How is your safety monitored during the trial?

Your health is monitored throughout the trial according to the procedures set out in the trial protocol, and this monitoring does not stop once the trial has been authorised. Depending on the trial, this may involve regular medical visits, laboratory tests, measurements or imaging^[5].

Not every health event that occurs during a trial automatically means that the investigational treatment caused it; researchers assess whether there may be a connection between the treatment and the event. Serious or unexpected safety issues are subject to specific reporting requirements, and new safety information can lead to extra precautions, changes to the protocol or participant information, or even suspension of the trial^[5].

At each stage of the trial, you have the right to be informed about your health status and to inspect your own records. You also have the right to receive information about any new data that could affect your decision to keep taking part. This access to your own results, alongside timely updates on emerging findings, is what allows continued participation to remain a genuinely informed and voluntary choice rather than a decision made once and never revisited^[1].

How does a trial weigh possible benefits against risks before you join?

Before a trial begins, it must undergo scientific and ethical review that considers whether the anticipated benefits justify the foreseeable risks to participants, whether adequate safety measures are in place, and whether the trial site is suitable. This review also covers participant information materials, informed consent forms and certain recruitment materials^[5].

Clinical trials can involve risk, in the same way that routine medical care and daily activities can carry risk. Most trials involve the risk of minor, short-lived discomfort, though some participants experience complications that need medical attention, and in rare cases participants have experienced serious or life-threatening complications from an experimental treatment. You will be told before entering a trial if a placebo is used, and placebos are not used where doing so would put you at risk, particularly in trials of treatments for serious illnesses^[6]. Weighing these risks against the potential benefits — which may include access to a promising new treatment before it becomes widely available, or simply the knowledge that you are contributing to research that could help future patients — is ultimately a personal decision^[2].

What should you ask the research team before you agree to take part?

• What costs will be covered, and what expenses can I be reimbursed for^[1]?
• What are my possible short-term and long-term risks and side effects^[6]?
• How will my health and safety be monitored while I am in the study^[4]?
• Whom do I contact with questions or if a problem occurs^[5]?
• What compensation arrangements apply if I am injured because of the trial^[2]?

Writing these questions down before your appointment, and asking the team to answer them in plain language rather than technical jargon, can help you compare answers if you are weighing more than one trial, or simply help you feel confident that you understand what you are agreeing to^[7].

When should you contact the investigator or the Patient Ombudsman?

Contact the principal investigator or the study centre as soon as you notice a change in your health, a new symptom, or a possible side effect, and before changing or cancelling a scheduled appointment where possible. If you believe you have suffered permanent damage to your health because of the investigational product or a required procedure, ask the investigator about seeking compensation, and, for trials that began after 14 April 2023, about submitting a claim to the Patient Ombudsman under the Compensation Fund^[1]. You can also talk with your doctor about specific risks and options before deciding whether to continue^[6].

Remember that participation is voluntary at every stage: you may withdraw your consent and stop taking part at any time and without giving a reason, and this does not cause you to lose your right to treatment. This guarantee is meant to remove any sense that withdrawing is a breach of an agreement; the trial relationship is built around your ongoing, freely given consent, not a binding contract that penalises you for changing your mind^[1].

Summary

Financial protection in a clinical trial has two separate parts: the sponsor pays for the investigational product, trial-related care and documented expenses as the study runs, and a separate compensation route exists if you are permanently harmed by the product or a required procedure. Read the cost and compensation sections of your informed consent document carefully, and ask the research team to explain anything you do not understand before you sign^[2].

Report any change in your health promptly, keep records and receipts for reimbursable expenses, and know that you can withdraw at any time without losing your right to treatment. If you were harmed in a trial that began after 14 April 2023, ask about the Clinical Trials Compensation Fund and how to apply through the Patient Ombudsman^[1].

1. [1] Charter of rights and obligations of a clinical trial participant (accessed 2 June 2026) — https://abm.gov.pl/download/1/8523/Charterofrightsandobligationsofaclinicaltrialparticipant.pdf
2. [2] What Is a Clinical Trial? - Cleveland Clinic (accessed 2 June 2026) — https://my.clevelandclinic.org/health/articles/clinical-trial
3. [3] Clinical Trial Compensation Guidelines - Association of the British Pharmaceutical Industry (ABPI) (accessed 2 June 2026) — https://www.abpi.org.uk/media/wz1k4sww/compensation_guidelines_2014.pdf
4. [4] Patients' Rights and Safety in Clinical Trials - Hepatitis B Foundation (accessed 2 June 2026) — https://www.hepb.org/treatment-and-management/clinical-trials/patients-rights-and-safety-in-clinical-trials/
5. [5] What rights and safeguards protect clinical trial participants? - British Research Panel (accessed 2 June 2026) — https://britishresearchpanel.co.uk/2026/09/04/clinical-trial-safeguards/
6. [6] Benefits, Risks, and Safety Measures - National Heart, Lung, and Blood Institute (NHLBI), NIH (accessed 2 June 2026) — https://www.nhlbi.nih.gov/research/clinical-trials/safety-benefits-risks
7. [7] Clinical Trials - Cleveland Clinic (accessed 2 June 2026) — https://my.clevelandclinic.org/clinical-trials