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Resources for finding trials

Reports of randomised controlled trials (RCTs) have been found in the resources listed below for the PRACTIHC project and systematic reviews undertaken for the Cochrane Collaboration, the University of Leeds and Nottingham University. The starred * resources are recommended as a bare minimum set to search.

When selecting a manageable set of resources to search for a review its helpful to consider

  • subject matter and scope of the review
  • availability of the resource
  • time available to undertake searching
  • expertise of the searcher
  • download features of the resource for reference management


* Recommended as the bare minimum sources to be searched for systematic reviews of RCTs
(S) Subscription required. Check if your institution subscribes
(International) Contains reports of trials from a variety of countries or reports of trials that are run across several countries
(OA) Contains Open Access, free full text articles

This page was last updated in April 2019. This is not a complete list of every source of RCTs. Currency, subscription requirements and open access availability can be difficult to verify, we apologise for any inaccuracies.


International Databases

Grey Literature Resources

Regional and National Databases (WHO regions)



  • LILACS  Latin-American and Caribbean Center on Health Sciences Information
  • SciELO (FFT) Brazil Scientific Electronic Library Online

Eastern Mediterranean Region

Other Databases (not verified and may not be accessible)

Further links and guidance

AUHE Information Specialists Geographic Search Filter: Low and Middle Income Countries (Developing Countries) studies 2003-2020 ODA recipients

Norwegian Satellite of the Cochrane Effective Practice and Organisation of Care Group. LMIC Databases, a downloadable description of databases, websites and journals relevant to low and middle income countries (LMICs). 2013

Norwegian Satellite of the Cochrane Effective Practice and Organisation of Care Group. LMIC Filters for MEDLINE (Ovid), EMBASE (Ovid), PubMed and CENTRAL (Web), based on 2009 World Bank list of LMICs.

Further links and guidance

Please send details of additional RCT-holding sources or updated information on the content and currency of listed sources to the AUHE Information Specialists. We aim to update this web page every year. Email

We acknowledge the support of the Cochrane Schizophrenia Group in developing this resource.