Clinical trials typically progress through four main phases, each serving distinct purposes and objectives:
Phase 1: Phase 1 trials focus on assessing the safety and tolerability of a treatment.
Phase 2: Phase 2 trials further evaluate the safety and efficacy of the investigational drug.
Phase 3: Phase 3 trials are large-scale studies designed to confirm the efficacy and safety of the investigational drug compared to standard treatment.
Phase 4: Phase 4 trials, also known as post-marketing or surveillance studies, occur after the drug has been approved for marketing and is available to the general population.
