Okay.
Often in the work I've done I've been told by GPs that they have serious concerns about capturing that type of information for two reasons. First, it can be de-identified but it's very difficult to make it truly anonymous, and they feel that puts their patient at some risk. Secondly, I've heard the argument made that this negatively impacts the relationship of confidentiality between the primary health care giver and the patient.
My last comment would be that I think we need to think more critically about the difference between research as a public interest or a public good and the commodification of this information for commercial purposes. PIPEDA already has exemptions for research for scholarly or statistical purposes, and that information is available, usually with consent, because most ethics committees are going to look for consent, and it does flow into the research community with certain ethical protections. You're talking a different thing when you're talking about selling the information in order to convince a doctor to give one particular pharmaceutical product rather than another that has the same medical indications.