Phase 3

A large study comparing a treatment against the current standard.

Learning 

What it means

Phase 3 studies enrol the largest numbers, often across many hospitals and countries, and compare the new treatment against the current standard or a placebo.

Why it matters if you take part

These are the studies regulators typically rely on when deciding whether to approve a treatment. They are usually the closest to ordinary care in how often you are seen.

Related terms

Trials recruiting now that are Phase 3

695 recruiting trials in our Canadian corpus are Phase 3.

This explains how clinical research works. It is not medical advice and does not describe any specific condition or treatment. Only a trial site can determine whether someone can take part in a study.