I can answer from the point of view of a community pharmacist. We systematically ask patients if they are taking any other medication before we dispense any drug. Once again, it comes down to educating patients.
Moreover, the federal government ran a campaign two years ago seeking to educate patients of the importance of informing their pharmacist of any other medication they were taking. The problem is that, often, patients do not see contraceptives and natural remedies as being medication. In their eyes, medication that you take occasionally is not medication either. That is why we systematically ask the question. As Ms. Gagnon was saying, there are cough syrups that can be highly toxic, and it is not just the combination of drugs that can cause problems. Some over-the-counter drugs are contra-indicated for diabetics and those with high blood pressure. Indeed, in Quebec, we systematically stick labels on drugs that those suffering from high blood pressure or diabetes should avoid.