Instead, they are allowed the time required to give proper attention to each participant of a clinical study. A placebo is an inactive, harmless agent used for testing against the active drug. The results of the active compound are compared with the placebo to better understand the actions of the active drug. Just as patients can refuse to participate in a study, they may choose to stop participation at any time. Note that the physician can withdraw the patient from the study if new potential risks are reported that could be deemed life-threatening or if the physician feels that the patient is no longer benefiting from the treatment.
Informed consent is required for participation in all clinical studies involving human subjects.
Individuals are given information about what is involved in the study, including possible benefits and risks. Questions are encouraged by the physician or study coordinator. After this information is presented, individuals can make a decision whether or not to participate. The individual's consent to participate is documented in their medical history.