In the United States, drugs must be approved by the Food and Drug Administration (FDA) before they can be sold. The FDA requires clinical trials to prove that the drugs are safe and effective, and to document risk factors and side effects. Clinical trials also determine the appropriate dosages, and the best ways to administer the drug.
There are four phases of clinical trials, and the entire process may take many years.
The drug is administered to a small group of patients (from 20 to 100), to be sure that is is safe before it is tested on larger groups.
The drug is administered to several hundred patients, to determine its effectiveness, and to continue to discover side-effects and risks.
The drug is administered to several thousand patients. The main goal at this stage is to test the drug on a wider range of patients, to learn things like how the drug interacts with other medications, or how it affects people who may have other medical conditions. The dosages and ways to administer the drug are further refined.
After one or more successful Phase III trials, the FDA can approve the drug. However, they may require a Phase IV trial, even after the drug is approved.
The drug is available for general use, either by prescription or over-the-counter. Data is gathered from a large number of patients, to continue to look for side effects or risk factors.
Who Conducts Clinical Trials
Trials may be conducted by hospitals, clinics, university researchers, or even private doctors. A medical doctor must lead the trial, but nurses, statisticians, clerical staff and even students may be involved.
Trials can be funded by hospitals, universities, research foundations, government agencies, or pharmaceutical companies. The FDA closely monitors all trials, to be sure that they are conducted properly.
- What is a Clinical Trial?, ED Treatment Information Center.
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