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About Clinical Trials

Clinical trials help us learn more about ways to prevent or treat medical conditions. Research must show a study medicine is safe and effective before it can be approved for use. Without these clinical research studies and the volunteers who take part in them, modern medicine would not exist.

Diverse representation matters in clinical research studies to understand how potential new drugs might work in every patient population. When you hear clinical research study or clinical trial, words like experimental or guinea pig might come to your mind. However, that is not how patients are treated.

The Four Phases of Clinical Trials

As a participant in a Phase 1 clinical trial, you’ll help researchers understand the safety of a study medicine. You may have frequent clinical exams and lab work, and will be asked to report any issues or side effects.

1 week to several months

20-100 participants

By joining a Phase 2 clinical trial, you’re helping researchers better understand how well the study medicine may work for the condition being studied, and the side effects that may occur.

1-2 years on average

Several hundred participants

In a Phase 3 clinical trial, you’ll be part of a larger group of people with the medical condition being studied. Your participation helps researchers determine whether the study medicine is safe and effective for people with that condition.

1-4 years on average

Several hundred to several thousands participants

Even after medicines are approved for use, you can continue to participate in long-term clinical studies (Phase 4) designed to better understand the effects of the approved medicine over time.

More than 1 year 

Several thousand participants

More on Clinical Trials

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What Are Clinical Trials
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Deciding to Take Part
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Written Guide

Frequently Asked Questions

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