Clinical Trials by Phase
Clinical trials progress through four phases, each with different goals, sizes, and risk profiles. Browse active recruiting trials at each stage of development.
Safety & dosing in 20–80 participants. First-in-human studies.
Efficacy & side effects in 100–300 participants.
Combined early safety + preliminary efficacy assessment.
Large-scale comparison vs. standard of care. 300–3,000+ participants.
Bridging efficacy assessment with large-scale comparison.
Post-market surveillance. Long-term safety in general population.
Early-phase, observational, or studies not requiring phase designation.
Phase data is sourced directly from ClinicalTrials.gov and reflects the trial's registered phase designation. Some trials span multiple phases (e.g. Phase 1/2). Counts reflect currently recruiting and active studies only.