@sel,
Hi Sel. Welcome to A2K.
Since we don't know what prescriptions you are taking and what drugs you are packaging, I don't think we can answer your question directly. I suggest you either talk to the nurse at your facility if you have one or wear a dust mask. They aren't that expensive or uncomfortable and will probably relieve your concern over the issue. Your employer may buy them for you. If you really believe you have a problem, you could complain to OSHA and they will investigate, but I wouldn't do that unless you complain to your employer first and get no response.