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Clinical trial registries are helpful for locating trials that haven't been published elsewhere. You can also locate results, protocols and contact information in these registries.
If you are interested in a specific drug or device, it is good practice to also check drug or manufacturer Web sites as well for anything that might be otherwise missed. See the 'Industry Sources' box on this page for more information.
Registry and results database of federally and privately supported clinical trials conducted in the United States and around the world.
metaRegister of Controlled Trials (Current Controlled Trials)
Collects records from a number of trials registries with a focus on the UK.
WHO International Clinical Trials Registry
Trial information from Australia, New Zealand, Brazil, China, India, Korea, Cuba, Germany, Iran, Japan, Pan African, Sri Lanka, and The Netherlands
EU Clinical Trials Register
Information dates from May, 2004. Contains only interventional trials. Does not include observational, device, surgical or psychotherapeutic trials.
Information about ongoing health services research and public health projects
International Standard Randomised Controlled Trial Number is a simple numeric system for the unique identification of randomized controlled trials worldwide.
Some information on trials may also be found by checking the manufacturers' Web sites. They can somtimes be difficult to navigate. Searching google for your keywords just in the company's domain may help if you're not having much luck using the site's search box. For GlaxoSmithKline, you might search site:gsk.com along with your keywords.
As an example, here is a link to GlaxoSmithKline's Clinical Study Register. Not all of the studies listed under "Results Summaries" have been published. The summary documents indicate whether the results have been published and, if so, where.
You may also want to consult the International Federation of Pharmaceutical Manufacturers and Associations site. A clinical trials portal is available under "Ethics".