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# Potassium Chloride ## Overview Potassium chloride (KCl) is an essential electrolyte used to treat and prevent hypokalemia. It is available in oral and intravenous formulations. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium replacement in conditions causing potassium loss (e.g., diuretic use, vomiting, diarrhea). ## Adult Dosing **Oral:** * **Treatment of Hypokalemia:** Typically 20-60 mEq per day, divided into 2-4 doses. Higher doses may be required under close medical supervision. Maximum daily oral dose is generally considered 100-120 mEq/day. * **Prevention of Hypokalemia:** Typically 10-20 mEq per day. **Intravenous (IV):** * **Treatment of Hypokalemia:** Dosing is individualized based on serum potassium levels and patient condition. Typical infusion rates should not exceed 10-20 mEq/hour. Higher concentrations (up to 40 mEq/L) and faster rates (up to 40 mEq/hour) may be used in emergencies (e.g., severe hypokalemia with cardiac arrhythmias) with continuous cardiac monitoring and specialized protocols. Maximum single IV dose is typically 40 mEq. Total daily IV dose should generally not exceed 200 mEq. ## Pediatric Dosing **Oral:** * **Treatment of Hypokalemia:** 1-3 mEq/kg/day divided into 2-4 doses. Maximum daily dose is generally 40 mEq/day. * **Prevention of Hypokalemia:** 0.5-1 mEq/kg/day divided into 1-2 doses. Maximum daily dose is generally 20 mEq/day. **Intravenous (IV):** * **Treatment of Hypokalemia:** Dosing is individualized based on serum potassium levels and patient condition. Typical infusion rates should not exceed 0.5 mEq/kg/hour (or 20 mEq/hour maximum). Higher concentrations and faster rates may be used in emergencies under strict monitoring and specialized protocols, as per local institutional guidelines. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution and often requires reduced doses or avoidance due to risk of hyperkalemia. ## Contraindications * Severe renal impairment. * Conditions where potassium levels are already elevated (hyperkalemia). * Untreated Addison's disease. * Potassium-rich foods or supplements in patients with hyperkalemia. ## Adverse Effects * **Common:** Nausea, vomiting, abdominal pain, diarrhea. * **Serious:** Hyperkalemia (manifesting as muscle weakness, paresthesias, bradycardia, arrhythmias, cardiac arrest), gastrointestinal obstruction or perforation (especially with sustained-release formulations). ## Key Drug Interactions * **ACE Inhibitors, ARBs, Potassium-Sparing Diuretics (e.g., spironolactone, amiloride), Trimethoprim:** Increased risk of hyperkalemia. * **NSAIDs:** May decrease the antihypertensive effect of potassium supplements and increase the risk of hyperkalemia. * **Digoxin:** Hypokalemia can increase digoxin toxicity; hyperkalemia can decrease it. ## Monitoring * Serum potassium levels (frequently, especially with IV administration or rapid dose changes). * ECG (especially with IV administration or in patients with cardiac risk factors or severe hypokalemia). * Renal function (serum creatinine). * Signs and symptoms of hyperkalemia. ## Clinical Pearls * Oral potassium chloride should always be taken with meals or fluids to minimize gastrointestinal irritation. * Dilute concentrated IV potassium chloride solutions appropriately. Never administer as a direct IV push. * Hypokalemia can potentiate digoxin toxicity. * Hyperkalemia is a medical emergency. * Dosing and infusion rates for IV potassium chloride, especially in critical care settings, may vary based on institutional protocols and physician orders. *** **Disclaimer:** This information is intended for clinical use and is not a substitute for comprehensive prescribing information. Always consult the most current drug monograph, institutional guidelines, and patient-specific factors before making any prescribing decisions.