Yeah normally the pharmacist will talk about that too. You know you're getting the good stuff when the person at the cash says "go to the next till, the pharmacist wants to talk to you".
I've never had a situation where I was on prescription drugs and also had to take stuff for a cold but I can see it being easy to overlook, when you have a cold you just want to throw everything you have at it and try to make it go away. It never works, but you still want to do it. Tylenol, Niquil, Sudafed, advil in an oregano oil sauce is basically my breakfast when I have a cold.