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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 formulations including oral tablets, capsules, powders, and intravenous solutions. ## Primary Indications * Treatment and prevention of hypokalemia. * Prevention of hypokalemia in patients receiving diuretics that deplete potassium. ## Adult Dosing * **Prevention of hypokalemia:** 20 mEq (1.5 g) orally once daily to 40 mEq (3 g) orally divided twice daily. * **Treatment of hypokalemia:** 40 mEq (3 g) orally to 100 mEq (7.5 g) orally per day, divided into 2 to 4 doses. * **Intravenous (IV) administration:** Recommended dose is typically 20 mEq to 40 mEq per dose. Maximum infusion rate is generally 10 mEq/hour. Higher doses or faster rates should only be administered in a monitored setting (e.g., ICU) and should not exceed 20 mEq/hour. Maximum total daily dose is typically 200 mEq. *Note: Specific dosing may vary based on the severity of hypokalemia, patient's clinical status, and local protocols.* ## Pediatric Dosing * **Prevention of hypokalemia:** 1 mEq/kg/day to 2 mEq/kg/day orally, not to exceed 3 g/day. * **Treatment of hypokalemia:** 2 mEq/kg/day to 5 mEq/kg/day orally, divided into 2 to 4 doses. * **Intravenous (IV) administration:** 0.5 mEq/kg to 1 mEq/kg per dose, not to exceed 20 mEq/dose. Maximum infusion rate is 0.3 mEq/kg/hour or 10 mEq/hour, whichever is less, in a monitored setting. *Note: Pediatric IV potassium administration requires extreme caution and careful monitoring due to the risk of fatal hyperkalemia. Dosing must be individualized and guided by serum potassium levels and renal function.* ## Dose Adjustments * **Renal Impairment:** Use with extreme caution and consider reduced doses. Potassium accumulation can occur. Monitor serum potassium closely. * **Hepatic Impairment:** Dose adjustments are generally not required unless hepatic encephalopathy is present. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia, such as untreated Addison's disease, chronic renal failure, or rapid tissue breakdown (e.g., severe burns, extensive trauma). * Known hypersensitivity to potassium chloride. * Certain gastrointestinal obstructions or delayed gastric emptying. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain. * **Serious:** Hyperkalemia (manifested as muscle weakness, fatigue, paralysis, cardiac arrhythmias, cardiac arrest), gastrointestinal ulceration, bleeding, and perforation (especially with sustained-release oral formulations). ## 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 increase serum potassium levels. * **Digoxin:** Hyperkalemia can potentiate digoxin toxicity. Hypokalemia can increase the risk of digoxin toxicity. ## Monitoring * **Serum potassium levels:** Frequently monitor, especially during IV administration, in patients with renal impairment, or when initiating/discontinuing interacting medications. * **Renal function:** Monitor BUN and creatinine. * **Electrocardiogram (ECG):** To detect signs of hyperkalemia (e.g., peaked T waves, flattened P waves, prolonged QRS). * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride should be taken with meals or a full glass of water to minimize gastrointestinal irritation. * Sustained-release formulations should not be crushed or chewed. * Dilute IV potassium chloride significantly before administration. Never administer undiluted. * Rapid IV infusion of potassium can cause pain, phlebitis, and potentially fatal cardiac arrhythmias. * Hypokalemia can be asymptomatic or present with nonspecific symptoms like fatigue and muscle cramps. *** **Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and guidelines, and use clinical judgment when making treatment decisions.