Clinical trials are the **last step** in drug development. You do experiments on cells in the lab and loads of animals before you even propose experiments in humans.
Initial trials are safety based, giving small amounts to healthy people without the condition in question to see how much is absorbed into the bloodstream. This checks for toxic reactions, side effects, and absorption/removal rates. These facts let you figure out how much to give at what rate (once a day, every 4 hours, …) to give the drug to maintain a level.
Then you start trials with people who would actually benefit from the drug, to measure effective doses (again starting very small) and look for effect over time relative to side effects.
Only when all these tests are favorable do you propose a controlled trial with a statistically significant number of actual patients.
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