Participating in a clinical trial can involve certain risks. Common risks include: ineffectiveness of the study drug, i.e., no relief or even worsening of symptoms, and the possibility of side effects. Costing the subject more time and effort, such as regular reviews and more treatments. A clinical trial is any systematic study of a drug in humans to confirm or reveal the effects, adverse reactions and the absorption, distribution, metabolism and excretion of the test drug, with the aim of determining the efficacy and safety of the test drug. The common risks of clinical trials are categorized as: 1. any drug may have side effects, so clinical trial drugs can have uncertain side effects. 2. When the drug under study is applied to the human body, the therapeutic effect of the clinical trial may not be as effective as conventional treatment, or may even be ineffective or make symptoms worse. 3. Participation in a clinical trial may require more time and effort on the part of the subject, such as regular checkups and additional treatments. Clinical trial research must follow medical ethics guidelines, and the doctor or researcher will try to minimize the risk to the subject. If you are thinking of participating in a clinical trial study, you must enroll in a regular medical facility.