Disclaimer: This is an early beta prototype. If you find any error, with data or functionality, please let us know via this page.

OpenTrials is a service provided by Open Knowledge International. Open Knowledge International’s contract with you for this service are on the terms of our general terms of use, as supplemented by these terms. In the case of any conflict, these specific terms will take precedence over the general terms.

Warning: We make absolutely no promises about the quality or existence of OpenTrials. Please read the sections below, and our general terms of use, including our general exclusion of liability.


We process personal data in accordance with our privacy policy. As part of this agreement you consent to our doing so. You should read the policy carefully, especially if you have any concerns about your privacy.

If you extract any email addresses or other contact information from our database, you should not use it for marketing or other promotional purposes. Please let us know about such addresses via our correction form or [email protected], so that we can remove or obfuscate them as appropriate.


We collect information from reputable sources, but we make no promises about the completeness, timeliness, or accuracy of the information we store and display. For example, we:

  • Gather some data from historical sources, which may have gaps common to any historical record;
  • May not be able to access all updates from the original sources, so a trial may be listed as ongoing after it has closed, or may not list all outcomes of the trial; and
  • Gather information from formats that may not perfectly preserve the original information, such as databases that contain scans of PDFs.

If you’re aware of such an issue, we invite you to submit corrections to us! We will attempt to correct it when possible.

We do not endorse the scientific, clinical, or ethical aspects of the trials we publish.

The information we publish is not a recommendation to use a particular medicine or participate in a particular trial. If you have questions about a particular treatment, please consult a healthcare professional.

Content and intellectual property

Using content from this site

You are free to use the data published on this site for any purpose, subject to the following conditions:

  • Content created by third parties is offered to you under their terms. Please see the full list of sources and links to their licensing terms, where available, in the External Sources section on this page. You should refer to the original source if you have questions about your rights to use this content.
  • Content we create, or which contributors submit directly to us, is offered under the Creative Commons Public Domain Dedication (usually called "CC0"). However, we encourage you to give appropriate credit to OpenTrials and OpenTrials contributors. For more details, see the full text of the license.

In addition, when using this data, we encourage you to:

  • Note the date you retrieved the data from us; and
  • Describe any modifications you made to the data.

Giving your content to us

If you contribute your data or content to us, for example by uploading it to our data contribution page, then you agree to license that content to the public under the Creative Commons Public Domain Dedication (usually called "CC0"). We will encourage others to attribute the material to you, as described in the previous section.

If you would like to contribute data to us, but cannot agree to the CC0 license, please send us an e-mail at [email protected].

Taking down content

If you believe that any content on OpenTrials is hosted in violation of relevant law, please notify us through this form.

Our software

The source code behind OpenTrials is available under a free license on GitHub.

General conditions

We may update these terms at any time. If we do so, we will announce the change on the OpenTrials website. Any changes will be binding on you when we announce them.

External sources