Researchers conduct clinical trials to evaluate the safety and effectiveness of investigational drugs. The process is expensive, long and complex. To better understand the importance of clinical trials in the United States and around the world, there are many useful resources. Learn more about the thousands of drugs currently in clinical studies. Learn why it takes 10 to 15 years to complete the testing and review process for each new medicine. Learn why trial results may still be useful for scientists even if an investigational drug is determined to be unsafe or ineffective.
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The International Federation of Pharmaceutical Manufacturers & Associations Clinical Trials Portal provides a single access point to trials worldwide.
CenterWatch, a Boston-based company, lists current trials worldwide and drugs newly approved by the U.S. Food and Drug Administration.
The National Institutes of Health provides this registry of federally and privately supported clinical trials conducted in the United States and around the world.