<unk>  is a polymer derived from polystyrene that is FDA approved for the treatment of hyperkalemia.   Common adverse reactions include anorexia, nausea, vomiting, and constipation.
Sodium polystyrene sulfonate
Dextran
Polystyrene sulfonate
Hyaluronic acid 
Poractant Alfa
Podofilox
Chondroitin sulfate
Gadoteric acid