Drug and Therapeutics Bulletin supports the campaign for all trials to be registered and for all results to be reported. DTB believes that the availability of such data is essential to ensure that medicines are used safely and effectively. With very few exceptions, DTB only uses source material that is published (or, very occasionally, ‘in press’). We closely ally ourselves with our readers and so only use data in the public domain. In this way, the basis for the conclusions is available to our readers for independent assessment.