Study Phases Overview

Phases of a Clinical Trial

Phases of a Clinical Trial

Clinical trials progress through structured phases to evaluate safety, effectiveness, and long-term outcomes.

Pre-clinical

Laboratory and animal studies assess safety and biological activity before testing in humans.

Phase 1

Small-group testing to evaluate safety, dosage limits, and side effects.

Phase 2

Expanded trials to assess effectiveness and continued safety monitoring.

Phase 3

Large-scale studies confirming effectiveness and comparing standard treatments.

Phase 4

Post-marketing studies tracking long-term outcomes and rare side effects.

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