International Clinical Trials Registry Platform (ICTRP)
The ICTRP is maintained the World Health Organization.
Please note that as of December 2020, the ICTRP search portal is experiencing a high volume search inquiries because of COVID-19 and may not be responsive.
ClinicalTrials.gov is provided by the National Library of Medicine (NLM). Studies registered on the website are from all 50 United States and 219 countries.
The European Union (EU) Clinical Trials Register
The register contains studies conducted in the European Union (EU) and the European Economic Area (EEA) as well as studies conducted outside the EU / EEA that are linked to European paediatric-medicine development.
The following website is a comprehensive resource with links to national and international clinical trials registers: https://sites.google.com/a/york.ac.uk/yhectrialsregisters/home/clinicaltrials
A broad therapy search will retrieve clinical trials, if you are interested in Randomized Clinical Trials (RCTs) only, you can change the scope from broad to specific/narrow.
The Cochrane Central Register of Controlled Trials (CENTRAL)
The records are pulled mainly from PubMed and Embase.
In the advanced search, you can select “Studies with Results” to retrieve only studies where the results have been reported:
“Trialstreamer is an artificial intelligence system, which finds and summarises new trial publications, registrations, and preprints in COVID-19.”
A real-time dashboard of clinical trials for COVID-19 developed by Thorlund, Kristian, et al.
“Anticovid is an open access platform which gathers all available information regarding global clinical trials for SARS-CoV 2.”