helps determine the scientific validity of the drug by obtaining data on the effectiveness of the drug for a particular indication or indications in patients with the disease or condition, and helps determine the common short-term side effects and risks associated with the drug
The drug development phase in which a new drug is tested for the first time on a small number of patients in order to judge its efficacy and tolerability.
After Phase I trials, a drug is tested for safety and efficacy in slightly larger numbers of people who are afflicted with the disease or condition for which the drug is being developed.