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# Potassium Chloride ## Overview Potassium chloride (KCl) is an electrolyte used to prevent or treat hypokalemia. It is available in oral and intravenous formulations. ## Primary Indications * Treatment and prevention of hypokalemia. * Prevention of hypokalemia in patients receiving potassium-wasting diuretics. * Adjunct therapy in patients with digitalis toxicity experiencing hypokalemia. ## Adult Dosing * **Oral:** * **Prevention:** 20 mEq (1.5 g) once daily to 40 mEq (3 g) divided twice daily. * **Treatment:** 40 mEq (3 g) to 100 mEq (7.5 g) daily, divided into 2-5 doses. Higher doses may be given under close supervision. * Maximum single oral dose: Generally limited to 20 mEq (1.5 g) per dose to minimize gastrointestinal upset and risk of hyperkalemia. * **Intravenous:** * **Treatment of Hypokalemia:** Dosing is based on serum potassium levels and clinical status. * Mild hypokalemia (e.g., 3.1-3.5 mEq/L): 20-40 mEq in 1 L of IV fluid over 2-4 hours. * Moderate hypokalemia (e.g., 2.6-3.0 mEq/L): 40-80 mEq in 1 L of IV fluid over 3-6 hours. * Severe hypokalemia (<2.5 mEq/L): May require 100-200 mEq or more over 12-24 hours, often in divided doses. * **Maximum infusion rate:** Generally should not exceed 20 mEq/hour in peripheral lines and 40 mEq/hour in central lines, unless in a life-threatening situation with continuous cardiac monitoring. * **Maximum concentration:** 40 mEq/L in peripheral IV lines; up to 100 mEq/L in central IV lines with cardiac monitoring. ## Pediatric Dosing * **Oral:** * Recommended daily allowance varies by age. Typical therapeutic doses range from 1-5 mEq/kg/day, not to exceed the adult maximum of 40 mEq/day unless under strict medical supervision. * **Intravenous:** * Dosing is highly individualized based on serum potassium, weight, and clinical condition. Follow institutional protocols or specific guidelines. General range: 0.5-1 mEq/kg/dose. * Maximum infusion rate: Generally 0.5-1 mEq/kg/hour (maximum 20 mEq/hour in peripheral lines, 40 mEq/hour in central lines). ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Dose reduction or avoidance may be necessary depending on the degree of renal impairment to prevent hyperkalemia. ## Contraindications * Hyperkalemia (serum potassium > 5.0 mEq/L). * Conditions causing rapid potassium release (e.g., severe burns, crush injuries, Addison's disease, certain types of renal failure). * Untreated adrenal insufficiency. * Concurrent use of potassium-sparing diuretics or ACE inhibitors in patients with impaired renal function may significantly increase risk. ## Adverse Effects * **Gastrointestinal (Oral):** Nausea, vomiting, diarrhea, abdominal pain, flatulence. Esophageal or gastric irritation/perforation can occur, especially with undissolved tablets or capsules. * **Cardiovascular (IV):** Arrhythmias, cardiac arrest (especially with rapid infusion or hyperkalemia). * **Systemic:** Hyperkalemia (muscle weakness, paresthesia, flaccid paralysis, cardiac arrhythmias, cardiac arrest). ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene), ACE inhibitors, ARBs, NSAIDs, heparin, trimethoprim:** Increased risk of hyperkalemia. * **Digitalis glycosides:** Hypokalemia can potentiate digitalis toxicity. Potassium administration should be done cautiously to avoid hyperkalemia. * **Renin inhibitors (e.g., aliskiren):** Increased risk of hyperkalemia. ## Monitoring * **Serum potassium:** Monitor frequently, especially during IV therapy, dose adjustments, or in patients with renal impairment or other risk factors. * **Renal function (BUN, creatinine):** Assess baseline and monitor periodically. * **ECG:** In patients receiving IV potassium, especially rapid infusions or those with significant hypokalemia or risk factors for hyperkalemia. * **Signs and symptoms of hyperkalemia:** Muscle weakness, paresthesias, changes in heart rhythm. ## Clinical Pearls * Oral potassium chloride should be taken with meals or a snack and a full glass of water to minimize gastrointestinal upset. * Liquid formulations may be preferred for patients who have difficulty swallowing or have a history of gastrointestinal issues. * IV potassium is a high-alert medication; double-check preparation and administration. * Always dilute IV potassium in an appropriate IV fluid. Never administer as a bolus. * In patients with impaired renal function, potassium supplementation should be approached with extreme caution and requires close monitoring. *** *This information is intended for healthcare professionals. Please consult the current prescribing information and institutional protocols for complete details before administering this medication.*