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# Potassium Chloride ## Overview Potassium chloride (KCl) is an electrolyte supplement used to treat or prevent hypokalemia. It is available in various oral and intravenous formulations. ## Primary Indications * Treatment and prevention of hypokalemia. ## Adult Dosing * **Oral:** * Prevention: 20 mEq (1.5 g) per day, divided into 1-2 doses. * Treatment: 40-100 mEq (3-7.5 g) per day, divided into 2-4 doses. Maximum daily dose generally not to exceed 200 mEq (15 g). * Extended-release formulations: Dosing varies by product; typically 10-20 mEq once or twice daily. * **Intravenous (IV):** * Dosing is highly individualized based on serum potassium levels and clinical status. * Mild hypokalemia (serum K 2.5-3.5 mEq/L): 10-20 mEq added to IV fluid over 1-2 hours. * Moderate hypokalemia (serum K 2.0-2.5 mEq/L): 20-40 mEq added to IV fluid over 2-4 hours. * Severe hypokalemia (serum K < 2.0 mEq/L): May require continuous infusion at rates up to 40 mEq/hour, but this should only be done in a monitored setting (e.g., ICU) due to risk of cardiac arrhythmias. * Maximum daily IV dose is generally not to exceed 200 mEq (15 g). * Concentration: For peripheral IV infusion, limit to 40 mEq/L to reduce phlebitis. For central IV infusion, concentrations up to 100 mEq/L may be used cautiously. ## Pediatric Dosing * **Oral:** * Recommended daily allowance (RDA) varies by age, typically 1-3 mEq/kg/day. * Treatment doses are individualized. Maximum daily dose generally not to exceed 200 mEq/day. * **Intravenous (IV):** * Dosing is individualized based on serum potassium levels and clinical status. * Maximum rate of infusion generally 0.3-0.5 mEq/kg/hour, but can be increased to 1 mEq/kg/hour in life-threatening situations under continuous cardiac monitoring. * Maximum concentration for peripheral IV infusion is 40 mEq/L. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Dosage reduction is necessary as renal excretion is the primary route of elimination. Monitor potassium levels closely. Avoid in severe renal impairment. ## Contraindications * Hyperkalemia. * Conditions that may predispose to hyperkalemia, such as uncontrolled Addison disease, systemic alkalosis, certain enzyme deficiencies (e.g., hereditary adrenal hyperplasia), severe tissue trauma, or extensive burns. * Use of potassium-sparing diuretics concurrently unless under close monitoring. ## Adverse Effects * **Most Common:** Gastrointestinal upset (nausea, vomiting, diarrhea, abdominal pain), especially with oral administration. * **Serious:** Hyperkalemia (symptoms include paresthesia, muscle weakness, flaccid paralysis, cardiac arrhythmias, bradycardia, hypotension, cardiac arrest), gastrointestinal ulceration, bleeding, or perforation (especially with enteric-coated or sustained-release oral formulations). Phlebitis with IV administration. ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **ACE inhibitors (e.g., lisinopril, enalapril) and ARBs (e.g., losartan, valsartan):** Increased risk of hyperkalemia. * **NSAIDs (e.g., ibuprofen, naproxen):** May decrease the efficacy of potassium supplements and increase the risk of hyperkalemia. * **Heparin:** May increase the risk of hyperkalemia. * **Digitalis glycosides:** Hyperkalemia can increase the toxicity of digitalis. Hypokalemia can increase sensitivity to digitalis. ## Monitoring * **Essential:** Serum potassium levels, especially during IV therapy, with dose changes, or in patients with renal impairment. * **Recommended:** * Renal function (serum creatinine, BUN). * Electrolytes (sodium, chloride, magnesium). * ECG for signs of hyperkalemia, particularly with rapid IV infusion or in patients with cardiac disease. * Signs and symptoms of hypokalemia (e.g., muscle cramps, weakness, constipation, cardiac arrhythmias) and hyperkalemia. * For oral formulations: Monitor for GI bleeding or ulceration. ## Clinical Pearls * Oral potassium chloride should be taken with meals or a full glass of water to minimize gastrointestinal irritation. * Sustained-release oral formulations are generally preferred to reduce GI side effects compared to standard tablets. However, they should not be crushed or chewed. * IV potassium is highly irritating to veins; always administer diluted and monitor for phlebitis. Rapid IV infusion can be fatal. * Always confirm the correct formulation (e.g., mEq vs. grams) and concentration before administration, especially for IV preparations. * The dose required to correct hypokalemia can be significantly higher than the RDA. *** *This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions. Local protocols may dictate specific dosing strategies.*