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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte supplement used to prevent or treat hypokalemia. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium replacement in patients receiving diuretics or corticosteroids. ## Adult Dosing * **Prevention of hypokalemia:** 20 mEq (1.5 g) orally once daily. * **Treatment of hypokalemia:** Dosing is highly individualized based on serum potassium levels and clinical status. Oral doses can range from 40-100 mEq (3-7.5 g) per day divided into 2-4 doses. Higher doses may be necessary in severe cases but should not exceed 20 mEq (1.5 g) per dose or 200 mEq (15 g) per day, divided doses, and given with caution under strict medical supervision. * **Intravenous (IV) administration:** Typically reserved for severe hypokalemia or when oral intake is not possible. Dosing is highly individualized. * **Mild to moderate hypokalemia (serum K 3.0-3.5 mEq/L):** Up to 10 mEq/hr IV. Maximum daily dose generally not to exceed 100-200 mEq/day. * **Severe hypokalemia (serum K < 2.5 mEq/L) or cardiac arrhythmias:** May require higher rates (up to 20-40 mEq/hr IV) and higher doses (up to 200 mEq/day), but **only in a monitored setting (e.g., ICU)** due to risk of cardiac arrest. **Maximum concentration for peripheral IV is typically 40 mEq/L; for central line, up to 100 mEq/L or higher under specific protocols.** * **Local protocols often dictate IV infusion rates, concentrations, and maximum doses.** ## Pediatric Dosing * Dosing is highly individualized based on age, weight, serum potassium levels, and clinical condition. * **Oral maintenance:** Typically 1-2 mEq/kg/day, divided into 1-4 doses, not to exceed 40 mEq/day. * **Oral treatment:** May require higher doses, up to 3-5 mEq/kg/day divided into 2-4 doses. * **Intravenous (IV) administration:** * **Maintenance:** 20-30 mEq/L of IV fluids. * **Repletion:** Dosing varies widely. Common practice is to infuse at a rate of 0.3-0.5 mEq/kg/hr, not to exceed 1 mEq/kg/hr or 10-20 mEq/hr, and often limited to a maximum daily dose of 200 mEq/day or 20 mEq/dose. **Infusion rates and concentrations must be carefully controlled and monitored, especially in neonates.** * **Local protocols and expert consultation are essential for pediatric IV potassium administration.** ## Dose Adjustments * **Renal impairment:** Use with extreme caution. Reduce dose significantly or avoid if possible. Monitor potassium levels closely. * **Adrenal insufficiency:** Dose may need to be reduced. ## Contraindications * Hyperkalemia. * Conditions causing generalized failure of mechanisms of potassium excretion (e.g., severe renal disease, untreated Addison's disease, acute dehydration, extensive tissue breakdown such as from severe burns or systemic infection). * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal pain, gastric irritation, ulceration, bleeding, perforation. * **Cardiovascular:** Arrhythmias, bradycardia, hypotension, cardiac arrest (especially with rapid IV infusion or hyperkalemia). * **Other:** Hyperkalemia (leading to muscle weakness, paralysis, paresthesias, confusion), phlebitis (with IV administration). ## Key Drug Interactions * **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), Potassium-sparing diuretics (e.g., spironolactone, amiloride), Trimethoprim, NSAIDs:** Increase the risk of hyperkalemia. * **Cyclosporine, Tacrolimus:** Increase the risk of hyperkalemia. * **Potassium-containing salt substitutes:** Can contribute to increased potassium intake and hyperkalemia. * **Sodium polystyrene sulfonate:** May decrease absorption of potassium chloride and other oral medications. ## Monitoring * **Serum potassium levels:** Frequently monitor, especially during treatment, with dose adjustments, and in patients with renal impairment. * **Renal function (BUN, creatinine):** Essential, particularly in patients with pre-existing renal disease. * **ECG:** Indicated for severe hypokalemia or suspected hyperkalemia. * **Urine output:** Monitor for adequate renal function. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride can be irritating to the gastrointestinal tract; take with food or a large glass of water. * Liquid formulations may be preferred for ease of dose titration, especially in pediatrics. * Rapid IV infusion of potassium chloride can be dangerous and potentially fatal, causing cardiac arrhythmias and arrest. **Always dilute and infuse slowly, and monitor ECG if indicated.** * The risk of hyperkalemia is increased in patients with impaired renal function, acidosis, and those taking ACE inhibitors, ARBs, or potassium-sparing diuretics. *** **Disclaimer:** This information is intended for healthcare professionals and does not replace the need to consult the official prescribing information and current clinical guidelines. Always verify current prescribing information before making clinical decisions.