Kayexalate (Sodium Polystyrene) Drug Information: Overdosage and Contraindications

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May 27, 2012

Kayexalate

Hyperkalemia (High Blood Potassium) »

What is hyperkalemia?

Hyperkalemia is common; it is diagnosed in up to 8% of hospitalized patients in the U.S. Fortunately, most patients have mild hyperkalemia (which is usually well tolerated). However, any condition causing even mild hyperkalemia should be treated to prevent progression into more severe hyperkalemia. Extremely high levels of potassium in the blood (severe hyperkalemia) can lead to cardiac arrest and death. When not recognized and treated properly, severe hyperkalemia results in a mortality rate of about 67%.

Technically, hyperkalemia means an abnormally elevated level of potassium in the blood. The normal potassium level in the blood is 3.5-5.0 milliequivalents per liter (mEq/L). Potassium levels between 5.1 mEq/L to 6.0 mEq/L reflect mild hyperkalemia. Potassium levels of 6.1 mEq/L to 7.0 mEq/L are moderate hyperkalemia, and levels above 7 mEq/L are severe hyperkalemia.

How does hyperkalemia affect t...

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OVERDOSE

Overdosage may result in electrolyte disturbances including hypokalemia, hypocalcemia, and hypomagnesemia. Biochemical disturbances resulting from overdosage may give rise to clinical signs and symptoms of hypokalemia, including: irritability, confusion, delayed thought processes, muscle weakness, hyporeflexia, which may progress to frank paralysis and/or apnea. Tetany may occur. Electrocardiographic changes may be consistent with hypokalemia or hypocalcemia; cardiac arrhythmias may occur. Appropriate measures should be taken to correct serum electrolytes (potassium, calcium, magnesium), and the resin should be removed from the alimentary tract by appropriate use of laxatives or enemas.

CONTRAINDICATIONS

Kayexalate (sodium polystyrene) is contraindicated in the following conditions: patients with hypokalemia, patients with a history of hypersensitiviry to polystyrene sulfonate resins, obstructive bowel disease, neonates with reduced gut motiliry (postoperatively or drug induced) and oral administration in neonates (see PRECAUTIONS).

Last reviewed on RxList: 2/28/2011
This monograph has been modified to include the generic and brand name in many instances.