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## Potassium Chloride ### Overview Potassium chloride (KCl) is an electrolyte replacement used to treat hypokalemia. It is available in oral and intravenous formulations. ### Primary Indications * Treatment and prevention of hypokalemia. ### Adult Dosing * **Oral:** * Prevention: 20 mEq once daily. * Treatment: 40-100 mEq daily in divided doses. Doses should not exceed 20 mEq per dose to minimize gastrointestinal irritation. * Maximum daily dose: Generally 200 mEq. * Formulations: Available as tablets (10 mEq, 20 mEq), capsules (10 mEq, 20 mEq), and liquid (20 mEq/10 mL). * **Intravenous:** * **Mild Hypokalemia (serum potassium 3.0-3.5 mEq/L):** 10-20 mEq infused over 1-2 hours. * **Moderate Hypokalemia (serum potassium 2.5-2.9 mEq/L):** 20-40 mEq infused over 2-4 hours. * **Severe Hypokalemia (serum potassium <2.5 mEq/L):** 40-60 mEq or more, infused cautiously, often in a critical care setting. * **Maximum infusion rate:** Typically 10-20 mEq/hour in peripheral lines; up to 40 mEq/hour in central lines with continuous ECG monitoring. Higher rates may be used in emergencies under close supervision. * **Maximum concentration:** Typically 40 mEq/L in peripheral lines; higher concentrations (e.g., 60-80 mEq/L) may be used in central lines. * **Total daily dose:** Rarely exceeds 200-240 mEq without specific indication and intensive monitoring. ### Pediatric Dosing * **Oral:** * Prevention: 1-2 mEq/kg/day, divided into 1-2 doses. * Treatment: 2-5 mEq/kg/day, divided into 2-4 doses. * Maximum daily dose: Generally 100 mEq/day or 20 mEq per dose. * **Intravenous:** * Dosing varies based on serum potassium levels, age, and clinical status. Commonly ranges from 0.25-1 mEq/kg per dose. * Maximum infusion rate: 0.3-0.5 mEq/kg/hour. Higher rates may be used in emergencies with ECG monitoring. * Maximum concentration: Generally 3 mEq/kg per dose, not to exceed 40 mEq/L in peripheral lines. * Consult pediatric critical care guidelines for specific protocols. ### Dose Adjustments * **Renal Impairment:** Use with extreme caution. Reduced doses or avoidance may be necessary due to the risk of hyperkalemia. * **Hepatic Impairment:** No specific dose adjustment, but monitor potassium closely. ### Contraindications * Severe renal impairment. * Conditions where hyperkalemia is present (e.g., untreated Addison's disease, severe burns, extensive tissue injury). * Patients receiving potassium-sparing diuretics concomitantly, unless closely monitored. * Known hypersensitivity to potassium chloride. ### Adverse Effects * **Gastrointestinal (Oral):** Nausea, vomiting, diarrhea, abdominal pain, GI bleeding, ulceration, perforation (especially with extended-release formulations or rapid administration). * **Cardiovascular (IV):** Hyperkalemia (arrhythmias, cardiac arrest), phlebitis, venous irritation. * **Neuromuscular:** Paresthesias, muscle weakness, paralysis. * **General:** Hyperkalemia. ### Key Drug Interactions * **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **NSAIDs:** May increase serum potassium levels and reduce renal excretion. * **Heparin:** May increase the risk of hyperkalemia. * **Digoxin:** Hyperkalemia can increase the risk of digoxin toxicity; hypokalemia can increase the risk of digoxin toxicity. ### Monitoring * Serum potassium levels (frequently, especially with IV administration or dose changes). * Renal function (BUN, creatinine). * ECG (especially with rapid IV infusion or in patients with cardiac disease). * Signs and symptoms of hypokalemia and hyperkalemia. ### Clinical Pearls * Oral potassium chloride should be taken with food or meals to minimize GI upset. * Crushing or chewing extended-release formulations can lead to rapid release of potassium and cause severe GI irritation or hyperkalemia. * Intravenous potassium chloride must be diluted and administered slowly to prevent cardiac arrhythmias and phlebitis. * Always verify the concentration and infusion rate for IV potassium to prevent potentially fatal errors. * In patients with severe hypokalemia and ECG changes or paralysis, IV administration is necessary. --- **Disclaimer:** This information is intended for healthcare professionals and is not a substitute for clinical judgment. Always consult the most current prescribing information and relevant guidelines for complete and up-to-date drug information.