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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.
Contains records from the following registers (updated at least annually)
ISRCTN Register (International).
National Institutes of Health (NIH) ClinicalTrials.gov.
Action Medical Research (UK).
The Wellcome Trust (UK).
Medical Research Council (UK).
UK trials (UK
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.