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# Potassium Chloride ## Overview Potassium chloride (KCl) is an essential electrolyte used to treat and prevent 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:** Typically 20-100 mEq per day, divided into 2-5 doses. Maximum daily dose is generally limited to 200 mEq. * **Prevention of Hypokalemia:** Typically 20-40 mEq per day. * **Intravenous (IV):** * **Treatment of Hypokalemia:** Dosing is highly individualized based on serum potassium levels and clinical status. Typical maintenance is 10-20 mEq per hour. Never administer undiluted. * **Maximum IV infusion rate:** Usually 10-20 mEq/hour. Higher rates (up to 40 mEq/hour) may be used in severe, life-threatening hypokalemia with continuous ECG monitoring and central venous access. Total daily dose should not exceed 200 mEq without careful consideration. ## Pediatric Dosing * **Oral:** * **Treatment of Hypokalemia:** 2-4 mEq/kg/day divided into 2-4 doses. Maximum daily dose generally 100 mEq. * **Prevention of Hypokalemia:** 1 mEq/kg/day. * **Intravenous (IV):** * Dosing is based on serum potassium levels and clinical assessment. A common guideline for moderate hypokalemia is 0.3-0.5 mEq/kg per dose infused over 2-3 hours, not to exceed 10-20 mEq/hour. * Extreme caution is advised with IV potassium in pediatric patients. Always verify specific protocols. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Dose reduction is necessary. Monitor potassium levels closely. * **Adrenal Insufficiency:** Increased risk of hyperkalemia. Use cautiously. ## Contraindications * Hyperkalemia. * Conditions that may lead to hyperkalemia, such as severe renal impairment, untreated Addison's disease, anuria, severe burns, or certain crush injuries. * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Most Common:** Gastrointestinal upset (nausea, vomiting, diarrhea, abdominal pain), particularly with oral administration. * **Serious:** * Hyperkalemia: Symptoms include fatigue, muscle weakness, paresthesias, confusion, arrhythmias, hypotension, and cardiac arrest. * IV administration: Phlebitis, venous irritation, and cardiac arrhythmias if infused too rapidly or in high concentrations. ## Key Drug Interactions * **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene), Aldosterone antagonists (e.g., eplerenone, spironolactone), Trimethoprim, certain NSAIDs:** Increased risk of hyperkalemia. * **Digoxin:** Hypokalemia increases the risk of digoxin toxicity. Hyperkalemia decreases the inotropic effect of digoxin. * **Neuromuscular blocking agents:** Hyperkalemia can potentiate the effects of these agents. ## Monitoring * Serum potassium levels (frequently, especially during IV administration and with dose adjustments). * Renal function (serum creatinine, BUN). * ECG (especially during rapid IV infusion or in patients with cardiac concerns). * Signs and symptoms of hypokalemia and hyperkalemia. ## Clinical Pearls * Oral potassium chloride tablets or capsules can cause gastrointestinal irritation, ulceration, and bleeding. Administer with food or fluids and advise patients to remain upright for at least 30 minutes after taking. * Liquid formulations are generally better tolerated. * IV potassium chloride should **never** be administered undiluted or as a bolus injection due to the risk of fatal hyperkalemia and cardiac arrest. * Concentrated solutions (e.g., >40 mEq/L in peripheral IVs, >20 mEq/L in adult central lines) can cause venous irritation and phlebitis. Follow institutional guidelines for maximum concentrations and infusion rates. *** **Disclaimer:** This information is intended for healthcare professionals and does not replace the need to consult current prescribing information, institutional protocols, and individual patient factors before making clinical decisions. Dosing and safety can vary, and specific local guidelines should always be followed.