From research questions to medical evidence
Inside Clinical Trials
Clinical trials help answer important health questions. Through carefully designed studies involving people, researchers evaluate healthcare interventions and generate evidence that can inform medical decisions.
What Is a Clinical Trial?
A clinical trial is a research study involving human participants that evaluates one or more health-related interventions. Trials may investigate medicines, vaccines, medical devices, diagnostic approaches, or other interventions to understand their effects on health outcomes.
The aim is not to assume that a new approach works, but to find out—through reliable evidence—whether it is beneficial, what risks it may carry, and for whom it may be appropriate.
A structured process connects a scientific question with findings that can improve healthcare.
The Clinical Trial Journey
Design
Review & consent
Conduct
Analyze
Share
Researchers define the question, outcomes, and study procedures in a protocol.
Required ethical and regulatory reviews take place. Eligible participants receive study information and decide whether to join.
The research team follows the protocol, collects data, and monitors participant safety.
Researchers assess the results to answer the study question and understand uncertainty.
Findings are reported to contribute to scientific knowledge and future care.
Phases of Clinical Trials
For medicines, clinical development commonly includes four phases. Each addresses different questions; not every trial follows this sequence, and some studies combine phases.
Phase I — Initial assessment of safety, tolerability, and dosing.
Phase II — Preliminary evaluation of efficacy and continued safety assessment.
Phase III — Larger studies to confirm efficacy and further characterize safety.
Phase IV — Research after approval to address additional questions about use, effectiveness and safety.
People and Participant Protection
Clinical trials bring together participants, investigators and research teams, sponsors, ethics committees, and regulators. Their responsibilities differ, but participant rights, safety, and well- being remain fundamental priorities. Participation is voluntary. Informed consent is an ongoing process, not merely a signature.
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Participants should receive understandable information, have opportunities to ask questions, and may withdraw without penalty or loss of benefits to which they are otherwise entitled. Studies also require appropriate safety monitoring and protection of personal information.
Every ethically conducted, scientifically sound clinical trial can help build a more informed future
for medicine.
Why Clinical Trials Matter
Clinical trials connect scientific discovery with evidence-based healthcare. They can identify useful interventions, clarify risks, and help determine which approaches should or should not be used in practice. Negative and inconclusive findings also advance knowledge when studies are well designed and transparently reported.
