If a trial is published, asking for data from the authors of the trial publication is an easy first step (but be prepared that this may not result in data).  Each of the web-based data sources has its own procedure for requesting data which is described on the relevant website. The EMA has a very simple procedure which is known as Ask EMA, and consists of filling out a simple form on EMA’s website. You are assured of an answer and you do not have to specify the reason for your request nor do you have to be a citizen of the EU.  For compounds on which a decision has been made since January 1, 2015, the EMA Clinical Data Publication website is a mould breaker for it does not request a request for data, only an account (the simplest of which can be created in minutes).