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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte used to prevent or treat hypokalemia. It is available in oral and intravenous formulations. ## Primary Indications * Treatment of hypokalemia. * Prevention of hypokalemia in patients at risk. ## Adult Dosing * **Oral:** * **Treatment of Hypokalemia:** 20-100 mEq per day, divided into 2-5 doses. Higher doses may be given in severe cases, but should not exceed 20 mEq in a single oral dose, and total daily intake should be limited to 200 mEq. * **Prevention of Hypokalemia:** 20-40 mEq per day, divided into 1-2 doses. * **Intravenous (IV):** * **Treatment of Hypokalemia:** Typically administered in a peripheral line at a concentration no greater than 40 mEq/L and a rate no faster than 10-20 mEq/hour. For severe hypokalemia or when rapid correction is needed, concentrations up to 100 mEq/L and rates up to 40 mEq/hour may be used in a central line under continuous cardiac monitoring. * **Prevention of Hypokalemia:** Typically 10-20 mEq per day. ## Pediatric Dosing * **Oral:** * **Treatment of Hypokalemia:** 2-5 mEq/kg per day, divided into 2-4 doses, not to exceed 20 mEq/dose or 100 mEq/day. * **Prevention of Hypokalemia:** 1-2 mEq/kg per day, divided into 1-2 doses, not to exceed 20 mEq/day. * **Intravenous (IV):** * **Treatment of Hypokalemia:** 0.5-1 mEq/kg per dose (maximum 20 mEq/dose) infused over 1-3 hours, or 20-40 mEq/L of IV fluid. Daily doses generally range from 2-4 mEq/kg/day (maximum 100-200 mEq/day). Rates should generally not exceed 0.5-1 mEq/kg/hour (maximum 20 mEq/hour) in peripheral lines. Central line administration allows for higher rates (up to 40 mEq/hour) with cardiac monitoring. Dosing must be individualized based on serum potassium levels and clinical status. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Dose reduction is necessary due to impaired potassium excretion. Monitor potassium levels closely. In severe renal impairment, potassium supplementation may be contraindicated. ## Contraindications * Hyperkalemia. * Conditions leading to increased potassium levels, such as severe renal impairment, untreated Addison's disease, acute dehydration, extensive tissue breakdown (e.g., severe burns, aplastic anemia), or the administration of potassium-sparing diuretics concurrently without close monitoring. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal discomfort. * **Serious:** Hyperkalemia (muscle weakness, fatigue, paresthesias, cardiac arrhythmias, cardiac arrest), gastrointestinal bleeding, ulceration, or perforation (especially with sustained-release oral formulations). ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **ACE inhibitors and ARBs:** Increased risk of hyperkalemia. * **NSAIDs:** May impair potassium excretion, increasing risk of hyperkalemia. * **Heparin:** May increase serum potassium levels. * **Salt substitutes:** Often contain potassium chloride, contributing to increased potassium intake and potential for hyperkalemia. ## Monitoring * Serum potassium levels should be monitored frequently, especially during IV administration or with high oral doses. * Renal function (BUN, creatinine) should be monitored. * ECG monitoring is recommended for IV infusions, particularly for high doses or rapid rates. * Monitor for signs and symptoms of hyperkalemia. ## Clinical Pearls * Oral potassium supplements should be taken with meals or food to minimize gastrointestinal upset. * Sustained-release formulations may have lower GI tolerance; however, they are often preferred for convenience and to reduce GI side effects. * IV potassium administration requires careful attention to concentration and rate to prevent phlebitis, pain, and potentially life-threatening cardiac arrhythmias due to rapid increases in serum potassium. * Electrolyte replacement should be guided by serum electrolyte levels and clinical assessment. *** **Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering any medication.