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How Your Medicines Are Put to the Test

Your Health / Managing Your Health / Clinical trials / How Your Medicines Are Put to the Test

Published on Nov 22, 2017
Authored by Pfizer Medical Team


When a doctor prescribes you a medicine, how does she know it could be helpful? Your doctor relies on experience, medical knowledge and training, but also on information and conclusions drawn from clinical trials. 

Clinical trials are research studies that test a medical intervention aimed at treating, diagnosing, or preventing a disease or health condition in human volunteers. The intervention could be a drug, a medical procedure or device, or a benavioural therapy, such as diet or exercise. 

Some clinical trials are done to test whether a drug or treatment is safe and effective for people to use. Others test two or more treatments to see which is more effective than the other(s). Clinical trials can also be done to investigate a drug or treatment in different groups of people, such as children, the elderly, or those with certain medical conditions.

How Do Clinical Trials Work?

Drugs are first subjected to non-human tests in a laboratory. These lab tests are done to determine a level of safety. Results of these tests are then sent to the medicines regulators, to determine if the treatment is safe enough to be studied in human volunteers.

Clinical trials in Australia are regulated by laws and codes of conduct that aim to protect trial participants and the integrity of the research. All clinical research projects in Australia must be approved by a Human Research Ethics Committee (HREC), which checks that the research conforms to the requirements of the National Statement on Ethical Conduct in Human Research. The Health Research Council of New Zealand contributes to maintaining an ethical and safe health research environment in New Zealand.

Clinical trials are conducted in phases. Each phase is designed to answer different questions that researchers may have about a drug or treatment.

How Can You Participate in a Clinical Trial?

In order to participate in a clinical trial you must meet the specific criteria defined for that clinical trial. These criteria can include things such as age, race, gender, past medical history, and your current health status. Healthy volunteers are needed for some studies, while for others, only those with certain conditions or diseases are eligible. 

To help protect your safety and to help you understand your role in the study; you’ll first be informed of the details of the trial and given information about its protocol. A trial’s protocol is the detailed plan that includes information on the reason for conducting the trial, eligibility guidelines, planned treatments and tests, potential side effects, and the length of the trial.

If you’re interested in enrolling in a trial, you will be given the opportunity to ask questions and obtain even more information. In order to enrol, you’ll also need to read and sign an informed consent form. This form describes the protocol to study volunteers and signing it indicates that you have been informed about the trial and its procedures. Signing this form also indicates that you have had and will continue to have the opportunity to ask questions about the purpose of the study and any potential risks. While signing this form also means that you agree to participate in the trial, you can still choose to withdraw at any time. 

How Can You Find a Trial That's Right for You?

The  US National Institutes of Health (NIH) maintains a database of clinical trials where potential participants can find information about trials that are recruiting as well as learn about completed trials. This database allows you to sort trials by disease, location and other considerations. It also includes trials that are recruiting participants in the United States as well as internationally. Information on clinical trials in Australia and New Zealand can be found at https://www.australianclinicaltrials.gov.au/ and http://clinicaltrials.health.nz/ respectively,

Contributor: Josefin Dolsten


    1. ClinicalTrials.gov. Learn about clinical studies. Accessed September 13, 2013.
    2. National Institutes of Health. The basics. Accessed September 13, 2013.
    3. CenterWatch. Connecting people with clinical trials. Accessed September 13, 2013.
    4. Food and Drug Administration. Inside clinical trials: testing medical products in people. Accessed September 13, 2013.
    5. Food and Drug Administration. The FDA’s drug review process: ensuring drugs are safe and effective. Accessed September 13, 2013.
    6. U.S. National Library of Medicine. Questions: what are clinical trial phases? Accessed September 16, 2013.
    7. ClinicalTrials.gov. Glossary of common site terms. Accessed September 16, 2013.
    8. ClinicalTrials.gov. ClinicalTrials.gov background. Accessed September 16, 2013.
    9. Australianclinicaltrials.gov.au/ Accessed 25 January 2017
    10. Hrc.govt.nz Accessed 25 January 2017

    Last reviewd: 07/04/2020

    External Resources

    -Australian Clinical Trials
    -Australian New Zealand Clinical Trials Registry
    -New Zealand Clinical Trials

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