I heard my GP tell someone that she has heard of such a thing too.
Wow! Such a thing like that would be great, there have been so many times docs had changed mom's meds (not psychiatric kind) that it was ashame, lucky for her she is subsidized,but the unused pills would help a lot of others.
I've had this experience with psych.meds. and also thought it was ashame. In my case,one of my brothers was able to use them. If anyone hears of a central drug type depot, it would be a good thing to post.