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.
Clinical Trial Phase Overview
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.