I use different means. I keep aspirin, tylenol and Ibuprofren all in one film canister (easy to recognize/distinguish). Immodium in blister foil packs. Prescription anithistamine in individual foil blister pack. Pepto bismol tablets in plastic blister pack. I also keep some antibiotic cream, some hand lotion, and some campho phenique in my first aid kit. I don't have much use for bandaids, but do carry a few of those.

I've not had any sort of problems with either blister packed meds or keeping them in my film canister. I've packed em like that for many years now.