Calcium polystyrene, also known as calcium polystyrene sulfonate (CPS), is a medication used to treat hyperkalemia, which is an abnormally high level of potassium in the blood. It is primarily used in patients with severe kidney disease or those undergoing dialysis who are unable to properly eliminate potassium through their urine.
Here's how it works:
- Ion-exchange resin: Calcium polystyrene is classified as an ion-exchange resin. This means it has the ability to bind to and exchange specific ions, in this case, potassium.
- Potassium removal: When taken orally or rectally, calcium polystyrene travels through the digestive system without being absorbed. Inside the intestine, it "traps" potassium by exchanging calcium ions for potassium ions. This trapped potassium is then eliminated in the stool.
Important points to remember:
- Not a first-line treatment: Calcium polystyrene is typically not the first-line treatment for hyperkalemia. Doctors may consider other interventions like dietary changes, potassium-lowering medications, or dialysis before resorting to its use.
- Side effects: While generally well-tolerated, calcium polystyrene can cause side effects like constipation, nausea, vomiting, and intestinal bezoars (hardened masses of undigested material). It can also lead to low levels of other electrolytes like magnesium and phosphorus.
- Dosage and administration: The dosage and administration of calcium polystyrene are determined by a healthcare professional based on individual needs and the severity of hyperkalemia.
- Not for everyone: This medication is not suitable for everyone, and people with certain medical conditions like heart failure or low blood calcium levels may not be able to take it.
It is crucial to remember that calcium polystyrene is a prescription medication and should only be taken under the supervision of a doctor. If you have any questions or concerns about this medication, consult your healthcare provider.