Clinical studies are an essential part of creating a new drug to help someone with a particular condition or disease. A new drug must go through comprehensive testing to ensure that it helps effectively treat a condition or disease for which it is targeting. It must also be safe enough for the person to take, and have as little side effects as possible. Clinical trials involving humans is one of the most important steps before a drug can be submitted to a regulatory agency for approval. There are several phases that a new drug must go through before it is considered for approval.