joebucks wouldn't have the same profile as otc drugs. i hve the same problem, i tried some of the membership rx programs in clickxcahnge and shareasale and they get lots of joins but no sale. joebucks does great for me now though with other sites.
what exactly are you looking for I am sure I can help you I deal with a far amount of pharam. are you looking for something specific? PLease PM I will steer you in the right direction.
There have been some mentions for Joebucks. - I would recommend however you look into Naturalbucks. Similar program to Joebucks but better rates - and they only have a few products which they support.