first thing that comes to mind is like a laxative type pill , but i could be very wrong.. I would suggest bring it to the pharmacy if you have no luck searching online .
i'm not exactly sure what the name of the pill is or what you would ask for if you were to go to the store to get it but it's an over the counter system flusher. the reason i'm sure of this is because it turned my urine the color of tomato soup after i took two of them.