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polystyrene sulfonate
Polystyrene sulfonates are polymers derived from polystyrene but containing sulfonic acid or sulfonate functional groups. The linear polymer is white when very pure and is water-soluble. The crosslinked material (called a resin) does not dissolve in water and typically appears amber in color. These polymers are classified as polysalts and ionomers. They are widely used to remove ions from a solution in technical or medical applications.〔
==Medical uses==
Polystyrene sulfonate is usually supplied in the sodium and calcium form. Its use as a potassium binders in acute and chronic kidney disease for people with hyperkalaemia (abnormal high blood serum potassium levels). It however is unclear if it works and there is concern about possible side effects when it is mixed with sorbitol.
Polystyrene sulfonates are administered orally (with a meal) or rectally, by retention enema.〔Medicines Complete: Martindale: The Complete Drug Reference, URL: http://www.medicinescomplete.com/mc/martindale/2009/5004-l.htm; Retrieved: 27 November 2009〕
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