WARNING: There are laws in America about prescription drugs. They have to be yours for you to have them and they must contain the drug that is prescribed on them. And just for a rule of thumb, just don't mess with cops and be careful who you do this in front of.
However, I know there are novelty items out there that you could imitate with this. For example: [link]
I use cough drops for the same purpose, but it does get funny looks. Of course, it's also practical, because cough drops do have this unpleasant tendency to melt in your pocket, which they don't in that little bottle. I've been doing it for about a decade.
My friend and I once bought a box of Tic-Tacs and ran up to random people on the street offering them the candy saying "Would you like some HAPPY PILLS?!" and held the Tic-Tac box in clear view. Some people laughed and took a mint, though most of them looked at us like this and backed away slowly.