<human>:  When a drug is discovered, what is the first thing that is done?
<bot>: The first thing that is done is to test the drug in a cell culture. This is done to make sure that the drug is safe and does not have any harmful side effects. After that, the drug is tested in animals to make sure that it is safe for humans. After that, the drug is tested in humans to make sure that it is safe and effective.