alt Hacker Newsyes. you have to recruit a diverse and representative population, which is very difficult and time-consuming. then, you have to spend several years conducting the trial. most of the time, the drug either has no effect or is actively harmful. 90% of drugs that go to clinical trials fail!
Is simulating the effects on humans not an option? Or is it that simulation technologies are not good (accurate) enough?
Thank you for entertaining my curiosity! I have been meaning to educate myself on this but don't know anybody in my circle who is knowledgeable in this field.