Prescription
Potassium binder (cation exchange resin)
Calcium Polysterene Sulphonate
Last reviewed April 2026
Who is this for?
What is this drug?
Calcium Polystyrene Sulphonate is a powder medicine that works in your gut like a sponge — it absorbs excess potassium from your body and replaces it with calcium, then carries the potassium out when you pass stool.
What is it used for?
High potassium levels in the blood (hyperkalaemia)which can happen with kidney problems or kidney failure
Prescription Required
A doctor's prescription is required to obtain this drug legally.