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A new drug is tested on healthy volunteers first (in what are called Phase 1 clinical trials) to determine if the drug is safe to give to humans. The drug company has already done extensive testing in cell cultures, tissue cultures, computer modeling and animal testing and is relatively sure that the drug is not dangerous, but cannot be sure until humans have taken the drug.

In Phase 2 clinical trials, people who are ill with the disease the drug is trying to cure or treat take it, again to test safety and also to get an idea of what the dosing should be, if there appears to be any benefit from the drug and what side effects there may be.

Phase 3 clinical trials are when a large number of people take the drug to see if it actually works; safety and dosage have already been determined.

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Edward Lakin

Lvl 10
3y ago

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