Kayexalate

Polystyrene sulfonates are a group of medications used to treat high blood potassium.[1] Effects generally take hours to days.[1] They are also used to remove potassium, calcium, and sodium from solutions in technical applications. Common side effects include loss of appetite, gastrointestinal upset, constipation, and low blood calcium.[1] These polymers are derived from polystyrene by the addition of sulfonate functional groups. Sodium polystyr... [wikipedia]