Phase 1

DRUG APROVED FOR TESTING IN HUMANS

20-80 healthy volunteers. Evaluate safety. Gather information about how a drug interacts with a healthy human body.

Phase 2

SAFETY & DOSING

100-300 volunteers. Evaluate safety and effectiveness. Check which dose works better. Monitor side effects.

Phase 3

SAFETY & EFFICACY

1000-3000 volunteers. Confirm effectiveness and monitor safety.

Phase 4

APPROVED DRUG

The drug is on the market. Gather information on the side effects associated with long term use.