http://clinicaltrials.gov/ct/gui/c/r/
National Library of Medicine, National Institutes of Health
ClinicalTrials.gov contains more than 4,000 federal and private medical studies involving patients and others at more than 47,000 locations nationwide. This database provides patients, families and members of the public with access to up-to-date information about the location of clinical trials, their design and purpose, criteria for participation, and, in many cases, further information about the disease and treatment under study.