👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Pharmacological Therapies🔖 Free to read, print, and share
Also known as: Kayexalate · SPS · potassium-lowering resin
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Use this quick-reference guide to spot, treat, and prevent Sodium Polystyrene Sulfonate on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Use
Hyperkalemia (K+ >5.0)
Exchanges Na+ for K+ in gut
✅ Action
Excretes K+ in stool
Slow onset → not emergency drug
✅ Do
PO or retention enema
Must have bowel movement
Recheck K+ after dose
🚩 Report
No BM/distension → bowel necrosis
Hypokalemia, fluid overload (Na+)
📚 Sodium Polystyrene Sulfonate — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Sodium polystyrene sulfonate is a cation-exchange resin used to treat hyperkalemia by binding potassium in the gut in exchange for sodium, then excreting it in the stool. It is given orally or by retention enema. Key principle: it works slowly, so it is not for emergency hyperkalemia, and the nurse must monitor for resulting hypokalemia and bowel necrosis.
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Key points
Understand these first
It lowers serum potassium by exchanging sodium for potassium in the bowel, excreting potassium in stool.
Onset is slow (hours), so it is not used alone for life-threatening hyperkalemia.
It can cause hypokalemia, sodium retention, and fluid overload.
It can cause intestinal necrosis, especially when combined with sorbitol or in postoperative patients.
A bowel movement is needed for the drug to work, so it is held if the patient is constipated or has ileus.
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Nursing priorities
What to do, in order
Monitor serum potassium before, during, and after therapy to avoid overcorrection.
Assess bowel sounds and bowel movements; the drug requires evacuation to be effective.
Monitor for sodium and fluid overload, especially in heart failure patients.
Assess for signs of bowel necrosis: abdominal pain, distension, and decreased bowel sounds.
For enema administration, ensure the resin is retained and then thoroughly removed.
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Red flags — report now
Escalate immediately
Report abdominal pain, distension, or absent bowel sounds (intestinal necrosis).
Report potassium dropping below 3.5 mEq/L (overcorrection to hypokalemia).
Do not rely on it for emergency hyperkalemia; it acts slowly.
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Labs & values
Numbers to know
Potassium 3.5-5.0 mEq/L
Sodium 135-145 mEq/L
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Patient teaching
What patients must know
A bowel movement is needed for the medicine to remove potassium.
Report constipation, severe abdominal pain, or swelling.
Follow up on potassium levels and dietary potassium restrictions.
❓ Sodium Polystyrene Sulfonate: NCLEX FAQs
What are the priority nursing interventions for Sodium Polystyrene Sulfonate?
Monitor serum potassium before, during, and after therapy to avoid overcorrection. Assess bowel sounds and bowel movements; the drug requires evacuation to be effective. Monitor for sodium and fluid overload, especially in heart failure patients. Assess for signs of bowel necrosis: abdominal pain, distension, and decreased bowel sounds.
What are the warning signs of Sodium Polystyrene Sulfonate a nurse must report?
Report abdominal pain, distension, or absent bowel sounds (intestinal necrosis). Report potassium dropping below 3.5 mEq/L (overcorrection to hypokalemia). Do not rely on it for emergency hyperkalemia; it acts slowly.
What do I need to know about Sodium Polystyrene Sulfonate for the NCLEX?
It lowers serum potassium by exchanging sodium for potassium in the bowel, excreting potassium in stool. Onset is slow (hours), so it is not used alone for life-threatening hyperkalemia. It can cause hypokalemia, sodium retention, and fluid overload. It can cause intestinal necrosis, especially when combined with sorbitol or in postoperative patients.
What patient teaching is important for Sodium Polystyrene Sulfonate?
A bowel movement is needed for the medicine to remove potassium. Report constipation, severe abdominal pain, or swelling. Follow up on potassium levels and dietary potassium restrictions.
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Quick Tip
It lowers serum potassium by exchanging sodium for potassium in the bowel, excreting potassium in stool.