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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte supplement used to treat and prevent hypokalemia. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium supplementation in patients receiving diuretics that deplete potassium. ## Adult Dosing * **Prevention of Hypokalemia:** * Typically 20 mEq (10 mmol) daily. * Higher doses may be needed, up to 40-100 mEq (20-50 mmol) daily, divided into 2-4 doses, depending on diuretic use and serum potassium levels. * **Treatment of Hypokalemia:** * **Mild (3.1-3.9 mEq/L):** 40-100 mEq (20-50 mmol) daily, divided into 2-4 doses. * **Severe (< 3.0 mEq/L):** Doses vary widely based on severity and clinical status. Intravenous administration is often preferred for severe hypokalemia. Oral doses can range from 100-200 mEq (50-100 mmol) over 24-48 hours. * **Maximum oral dose:** Generally not to exceed 100 mEq (50 mmol) per dose or per day without careful monitoring, especially in patients with renal impairment. Individualize based on clinical response and serum potassium. ## Pediatric Dosing * **Prevention of Hypokalemia:** 1-2 mEq/kg/day (0.5-1 mmol/kg/day), maximum 40 mEq (20 mmol) per day. * **Treatment of Hypokalemia:** 2-5 mEq/kg/day (1-2.5 mmol/kg/day), divided into 2-4 doses. Higher doses may be required under close medical supervision. Maximum 10-20 mEq (5-10 mmol) per dose. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Dosage reduction is necessary. Monitor serum potassium closely. Avoid if severe renal impairment exists. * **Adrenal Insufficiency:** Use with caution. ## Contraindications * Hyperkalemia (serum potassium > 5.0 mEq/L or 5.0 mmol/L). * Conditions causing generalized increases in serum potassium, such as severe renal failure, untreated Addison's disease, rapid tissue breakdown, or administration of potassium-sparing diuretics. * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Gastrointestinal:** Nausea, vomiting, abdominal pain, diarrhea, gastrointestinal bleeding, ulceration, perforation, obstruction. * **Cardiovascular:** Cardiac arrhythmias, cardiac arrest (especially with rapid intravenous administration or hyperkalemia). * **Other:** Hyperkalemia. ## Key Drug Interactions * **Potassium-Sparing Diuretics (e.g., spironolactone, amiloride):** Increased risk of hyperkalemia. * **ACE Inhibitors (e.g., lisinopril, enalapril) and ARBs (e.g., losartan, valsartan):** Increased risk of hyperkalemia. * **NSAIDs:** Can decrease renal excretion of potassium, increasing the risk of hyperkalemia. * **Heparin:** May impair potassium excretion and increase the risk of hyperkalemia. * **Digoxin:** Hyperkalemia can increase the risk of digoxin toxicity. Hypokalemia can also increase digoxin toxicity. ## Monitoring * Serum potassium levels (frequency depends on dose, indication, and renal function). * ECG for signs of hyperkalemia, especially in patients receiving high doses or with underlying cardiac conditions. * Renal function (serum creatinine, BUN). * Signs and symptoms of hypokalemia and hyperkalemia. ## Clinical Pearls * Oral potassium chloride solutions or powders should be diluted before administration to reduce gastrointestinal irritation and risk of esophageal injury. * Slow-release potassium chloride formulations may have reduced gastrointestinal toxicity but can still cause severe gastrointestinal problems. * Intravenous potassium chloride must be administered slowly and diluted to avoid potentially fatal cardiac arrhythmias and local vein irritation. Maximum recommended peripheral infusion rate is typically 10 mEq/hour (5 mmol/hour), and maximum concentration is 40 mEq/L (20 mmol/L). Higher rates and concentrations may be used in critical care settings with continuous ECG monitoring. * The goal of therapy is to restore serum potassium to the normal range (3.5-5.0 mEq/L or 3.5-5.0 mmol/L) without causing hyperkalemia. *** **Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and guidelines for definitive drug management. Dosing and management may vary based on individual patient factors and local protocols.