I think you can apply blockchain technology in the information about medicines and practices and its effectiveness with few actual documentations of the people who take it or undergo with a certain treatment without the need of disclosing names just name of the hospital or place and then if the doctor wants to know more information then he can just directly contact the hospital where the medicine is actually use or the treatment is performed. This way, doctors will have an idea if a particular sickness or disease has some suggested medicines if they don't have experience with it before.