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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte replacement. It is essential for nerve conduction, muscle contraction, and maintaining acid-base balance. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium supplementation when dietary intake is insufficient. ## Adult Dosing * **Oral:** Dosing varies widely based on serum potassium levels and clinical situation. Typical maintenance doses range from 20-60 mEq/day divided into 1-4 doses. For treatment of hypokalemia, doses can range from 40-100 mEq/day. Maximum single oral doses are typically 20-25 mEq to minimize gastrointestinal upset. * **Intravenous (IV):** Dosing varies based on serum potassium level and severity of hypokalemia. * Mild to moderate hypokalemia: 20-40 mEq in 1 L of IV fluid, infused over 2-6 hours. * Severe or symptomatic hypokalemia: Doses up to 80-100 mEq may be required. Administer via a central line if concentration exceeds 10 mEq/100 mL or infusion rate exceeds 10 mEq/hour. Maximum infusion rate generally not to exceed 20 mEq/hour in adults unless in a life-threatening situation and with continuous ECG monitoring. Total daily dose typically not to exceed 200 mEq. Dosing regimens are often guided by institutional protocols and continuous ECG monitoring, especially for IV administration. ## Pediatric Dosing * **Oral:** Maintenance: 2-4 mEq/kg/day, not to exceed 100 mEq/day. Treatment of hypokalemia: 4-10 mEq/kg/day, not to exceed 100 mEq/day. * **Intravenous (IV):** Maintenance: 20-30 mEq/L of IV fluid. For documented hypokalemia, doses are typically 0.5-1 mEq/kg per dose, infused over 1-3 hours, not to exceed 0.25 mEq/kg/hour. Higher doses (up to 2 mEq/kg/dose) may be used for severe hypokalemia with continuous ECG monitoring. Maximum concentration for peripheral administration is 40 mEq/L; for central administration, 80 mEq/L. Specific pediatric dosing should be based on serum potassium levels, age, weight, and clinical status. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Reduce dose and monitor serum potassium closely. In severe renal impairment, potassium supplementation may be contraindicated. * **Hepatic Impairment:** Dose adjustments are generally not required, but monitor electrolytes. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia (e.g., severe renal impairment, untreated Addison's disease, acute dehydration, extensive tissue breakdown). * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal discomfort (especially with oral formulations). * **Serious:** Hyperkalemia (can be life-threatening, manifesting as muscle weakness, paresthesias, cardiac arrhythmias, cardiac arrest), ECG changes (peaked T waves, flattening of P waves, prolonged QT interval, ST segment depression, disappearance of P waves, widening of QRS complex). ## Key Drug Interactions * **ACE Inhibitors, Angiotensin Receptor Blockers (ARBs), Potassium-Sparing Diuretics (e.g., spironolactone, amiloride), Aldosterone Antagonists, NSAIDs, Heparin, Trimethoprim:** Increased risk of hyperkalemia. * **Potassium-Losing Diuretics (e.g., furosemide, hydrochlorothiazide):** May increase the need for potassium supplementation, but concurrent use requires careful monitoring of potassium levels to avoid both hypokalemia and hyperkalemia. * **Digoxin:** Hyperkalemia can increase digoxin toxicity. Hypokalemia can also potentiate digoxin toxicity. ## Monitoring * **Serum Potassium Levels:** Monitor frequently, especially during initiation, dose changes, and in patients with renal impairment or risk factors for hyperkalemia. * **Renal Function:** Monitor BUN and creatinine. * **ECG:** Monitor for changes suggestive of hyperkalemia, particularly with IV administration or rapidly changing potassium levels. * **Signs and Symptoms of Hyperkalemia:** Muscle weakness, fatigue, palpitations, paresthesias. * **Acid-Base Balance:** Monitor electrolytes and arterial blood gases if indicated. ## Clinical Pearls * Oral potassium chloride is often formulated as extended-release tablets or solutions. Extended-release tablets should be swallowed whole and not crushed or chewed to avoid rapid release and potential gastrointestinal irritation. * Dilute IV potassium chloride appropriately to prevent phlebitis and ensure safe administration. * Always ensure adequate urine output before administering potassium, especially intravenously. * Hypokalemia can be exacerbated by certain medications (e.g., corticosteroids, beta-agonists) and conditions (e.g., vomiting, diarrhea, nasogastric suction). This information is intended for healthcare professionals. Always verify current prescribing information and consult with a pharmacist for individualized patient care.