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# Potassium Chloride ## Overview Potassium chloride (KCl) is an electrolyte supplement used to treat or prevent hypokalemia. It is available in various oral and intravenous formulations. ## Primary Indications * Treatment of hypokalemia. * Prevention of hypokalemia, particularly in patients receiving diuretics or other medications that deplete potassium. ## Adult Dosing * **Oral:** * **Treatment of hypokalemia:** Typically 20-60 mEq per day in divided doses. Higher doses may be used under close medical supervision. * **Prevention of hypokalemia:** Typically 20 mEq per day. * Maximum oral dose: Generally not to exceed 100-150 mEq per day, divided. * *Specific dosing often depends on serum potassium levels and local protocol.* * **Intravenous (IV):** * **Treatment of hypokalemia:** Typically 10-40 mEq per 24 hours, added to a large volume IV fluid. * Maximum IV infusion rate: Do not exceed 10-20 mEq per hour in peripheral lines, and not exceeding 20-40 mEq per hour in central lines, to avoid cardiac arrhythmias. * Maximum concentration: Typically 40 mEq/L for peripheral infusions and up to 80 mEq/L for central infusions. * *IV doses and rates are highly individualized based on severity of hypokalemia, cardiac status, and renal function. Strict adherence to infusion rate and concentration is critical.* ## Pediatric Dosing * **Oral:** * **Treatment of hypokalemia:** 2-5 mEq/kg/day in divided doses. * **Prevention of hypokalemia:** 1 mEq/kg/day. * Maximum oral dose: Generally not to exceed 3 mEq/kg/day or 60 mEq/day, whichever is less. * *Formulation choice (liquid vs. tablet) is important for pediatric patients.* * **Intravenous (IV):** * **Treatment of hypokalemia:** 0.5-1 mEq/kg/dose infused over 1-3 hours. * Maximum IV infusion rate: 0.5 mEq/kg/hour, or 20 mEq/hour, whichever is less. * Maximum daily dose: 3-4 mEq/kg/day or 100 mEq/day, whichever is less. * *IV therapy in pediatrics requires very careful monitoring and adherence to recommended rates and concentrations.* ## Dose Adjustments * **Renal Impairment:** Potassium chloride should be used with extreme caution or avoided in patients with severe renal impairment due to the risk of hyperkalemia. Dose reductions are necessary in moderate impairment. ## Contraindications * Hyperkalemia. * Conditions where potassium administration may lead to severe adverse effects (e.g., severe burns, crush injuries, adrenal insufficiency, advanced renal failure). * Gastrointestinal obstruction or delayed gastric emptying. ## Adverse Effects * **Common:** Nausea, vomiting, abdominal discomfort, diarrhea. * **Serious:** Hyperkalemia (manifesting as muscle weakness, fatigue, paresthesias, arrhythmias, cardiac arrest), gastrointestinal ulceration, bleeding, 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 reduce potassium excretion, increasing risk of hyperkalemia. * **Heparin:** May increase serum potassium. * **Digoxin:** Hyperkalemia may increase digoxin toxicity; hypokalemia may decrease digoxin's therapeutic effect and increase toxicity. ## Monitoring * **Serum potassium levels:** Monitor frequently, especially during initiation of therapy, dose changes, or in patients with impaired renal function. * **Renal function (BUN, creatinine):** Assess baseline and periodically. * **ECG:** To monitor for cardiac effects of electrolyte imbalances, particularly during IV administration or in patients with pre-existing cardiac conditions. * **Signs and symptoms of hyperkalemia:** Muscle weakness, fatigue, ECG changes. ## Clinical Pearls * Oral potassium chloride should be taken with meals or milk to minimize gastrointestinal upset. * Liquid formulations are often preferred for pediatric patients or those with difficulty swallowing. * Sustained-release oral formulations may have a higher risk of gastrointestinal ulceration and should be used cautiously. * IV potassium chloride administration requires careful dilution and slow infusion rates to prevent potentially fatal arrhythmias. Always use an infusion pump. * Always confirm the mEq (milliequivalents) of potassium per unit of product (e.g., per tablet, per 5mL liquid, per mL of IV solution) as concentrations vary. *** *This information is intended for clinical use and does not replace comprehensive drug reference materials. Always consult the most current prescribing information and institutional protocols.*