Anytime one of my customers has a question about their meds, that's the first thing I tell them to do. Sometimes, the only info a doc has is what the Drug Rep tells them. Better docs investigate, but, you never know what/or how far they take that. Pharmacists are tested on their knowledge (depending on where they work) every six months to every 18 months. They must know the recommended dosages, side effects & conterindications (interactions with other meds).