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# Potassium Chloride ## Overview Potassium chloride (KCl) is an essential electrolyte that plays a critical role in nerve impulse transmission, muscle contraction, and maintaining acid-base balance. It is available in oral and intravenous formulations. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium supplementation in patients receiving diuretics that deplete potassium. ## Adult Dosing * **Oral:** * For mild hypokalemia: 20-40 mEq daily in 1-2 divided doses. * For severe hypokalemia or to rapidly replete potassium: 40-100 mEq daily in 2-4 divided doses. * Maximum single oral dose: Generally limited to 20 mEq per dose to minimize gastrointestinal adverse effects. * Maximum daily oral dose: Typically 100-200 mEq, depending on clinical status and monitoring. * **Intravenous (IV):** * For mild to moderate hypokalemia: 20-40 mEq added to 1 liter of IV fluid over 2-6 hours. * For severe hypokalemia or cardiac arrest: Up to 100 mEq in 1 liter of IV fluid infused over 1-2 hours; higher doses may be administered rapidly in life-threatening situations with continuous cardiac monitoring. * Maximum IV infusion rate: * Peripheral line: 10 mEq/hour. * Central line: Up to 20 mEq/hour; rates up to 40 mEq/hour may be used in critical care settings with continuous cardiac monitoring. * Maximum concentration: * Peripheral line: 40 mEq/L. * Central line: Up to 100 mEq/L, but lower concentrations are preferred. ## Pediatric Dosing * **Oral:** * Recommended daily allowance varies by age: 1-3 years: 30 mEq; 4-8 years: 35 mEq; 9-13 years: 45 mEq; 14-18 years: 75 mEq. * Therapeutic doses for hypokalemia: 1-2 mEq/kg/day in divided doses, not to exceed adult maximums. * **Intravenous (IV):** * Maintenance: 2-4 mEq/kg/day, usually infused with other electrolytes. * Repletion of hypokalemia: 0.5-1 mEq/kg/dose, infused over 1-3 hours. Total daily dose typically does not exceed 3 mEq/kg/day or 100 mEq/day. * Maximum IV infusion rate: Generally 0.3-0.5 mEq/kg/hour (approximately 10-20 mEq/hour), with higher rates only in emergent situations and with close monitoring. * Maximum concentration: Generally 40 mEq/L. ## Dose Adjustments * Renal impairment: Dose reduction is necessary. Monitor potassium levels closely. In severe renal impairment, potassium supplementation may be contraindicated. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia (e.g., severe renal impairment, untreated Addison's disease, severe tissue trauma). * Certain medications that increase potassium levels (e.g., potassium-sparing diuretics, ACE inhibitors, ARBs, NSAIDs). ## Adverse Effects * **Gastrointestinal (Oral):** Nausea, vomiting, diarrhea, abdominal pain, GI bleeding, ulceration, or perforation (especially with sustained-release formulations or rapid ingestion). * **Cardiovascular (IV):** Hyperkalemia, which can lead to cardiac arrhythmias, ECG changes (peaked T waves, prolonged QRS, absent P waves), hypotension, and cardiac arrest. * **Other:** Hyperkalemia can cause muscle weakness, paresthesias, and confusion. ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), NSAIDs:** Can increase serum potassium by reducing renal excretion. * **Digoxin:** Hyperkalemia can decrease digoxin efficacy and increase toxicity. Hypokalemia can increase digoxin toxicity. * **Neuromuscular blocking agents:** Hyperkalemia can potentiate neuromuscular blockade. ## Monitoring * Serum potassium levels: Frequently, especially during IV administration, rapid repletion, and in patients with renal impairment. * ECG: For signs of hyperkalemia, particularly during rapid IV infusion or in patients with underlying cardiac disease. * Renal function (BUN, creatinine). * Signs and symptoms of hypokalemia and hyperkalemia. ## Clinical Pearls * Oral potassium chloride should always be diluted in a beverage (water, juice) or food to minimize gastrointestinal irritation. * Sustained-release oral formulations can be associated with small bowel stenosis or obstruction; use with caution and instruct patients to report any severe abdominal pain or GI symptoms. * IV potassium must be administered with caution due to the risk of rapid hyperkalemia and cardiac arrest. Never administer IV KCl undiluted as a bolus. * Correct hypomagnesemia concomitantly, as it can impair potassium repletion. * In patients with ongoing potassium losses (e.g., vomiting, diarrhea, diuretics), potassium replacement needs to be continuous. *** *Please consult the most current prescribing information and institutional protocols for definitive guidance. This information is not a substitute for professional medical advice.*