Everyone has stuff in the back of the medicine cabinet that they probably should get rid of. (It can't just be me, right?) There are expired medications, unused prescriptions, leftover vitamins, and allergy pills that time forgot. Or at least there could be, as I'm sure everyone has something a little different in there.
It's a good idea to periodically go through the place you keep medications and vitamins and get rid of the things that are no longer any good. It's not safe to keep expired medication - especially if it's life saving stuff like an epi-pen or heart meds.
If you live in Canada - consult the link below to find out more about how you can safely dispose of your old vitamins/medications. If you live outside of Canada, you can start by asking your local pharmacy if they have a collection program for this stuff. If they say know - try asking why not and see if you can work with them to find a way to start a safe disposal program.