A clinical trial is a test in humans to evaluate biomedical or health-related outcomes, including experimental medications or therapies. Clinical trials are experiments, not treatments, and participation requires careful consideration.
Although it's possible to benefit from participating in a clinical trial, it's also possible that no benefit — or even harm — may occur. Keep your MDA clinic  doctor informed about any clinical trial participation. (Note that MDA has no ability to influence who is chosen to participate in a clinical trial.)
Clinical trials are conducted in a series of successive steps, called phases. Each phase is designed to answer a separate research question.
*Note: Some clinical trials are not assigned a phase by the U.S. Food and Drug Administration (FDA). These include trials that test devices or behavioral interventions.