It doesn't hurt if you check out what you take too, even if a doc follows you up. I have a friend who is on 19 different meds for different mental and physical ailments and all prescribed my the same doc. I ran them through a interaction checker and got I think about 20 moderate interactions (most about the same thing, mental dulling), and one severe total no-no warning about serotonine syndrome.

Still my friend trusts his doc so he never questions a thing. I don't think complete trust is healthy either. Docs can be sloppy and miss things.