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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte supplement used to treat and prevent hypokalemia. It is available in oral and intravenous formulations. ## Primary Indications * Treatment of hypokalemia. * Prevention of hypokalemia in patients at risk (e.g., those on diuretics, laxatives, or with significant gastrointestinal losses). ## Adult Dosing * **Oral:** * **Treatment of hypokalemia:** 20-100 mEq per day in divided doses. A common starting dose is 40 mEq per day. Doses greater than 20 mEq per day should be administered in divided doses. * **Prevention of hypokalemia:** 10-20 mEq per day. * **Maximum single oral dose:** Generally 20 mEq. * **Intravenous (IV):** * **Treatment of hypokalemia:** 10-20 mEq per hour. In severe cases, rates up to 40 mEq per hour may be used with continuous cardiac monitoring, typically in an ICU setting. * **Maximum single IV dose:** Not to exceed 40 mEq in a single infusion bag or bolus. * **Maximum infusion rate:** Generally 10 mEq per hour peripherally. Higher rates (up to 20 mEq/hr centrally, or higher with continuous cardiac monitoring) may be considered based on clinical status and local protocol. * **Maximum concentration (peripheral IV):** 40 mEq/L. * **Maximum concentration (central IV):** 100 mEq/L. ## Pediatric Dosing * **Oral:** * **Treatment of hypokalemia:** 1-2 mEq/kg/day in divided doses, not to exceed adult doses. * **Prevention of hypokalemia:** 0.5-1 mEq/kg/day. * **Intravenous (IV):** * **Treatment of hypokalemia:** 0.5-1 mEq/kg per dose, not to exceed 20 mEq per dose, infused over 1-4 hours. Higher rates (up to 40 mEq/hr) may be used in emergent situations with continuous cardiac monitoring. * **Maximum daily dose:** Generally 3 mEq/kg/day or 200 mEq/day, whichever is less, when infused peripherally at a maximum rate of 10 mEq/hr and concentration of 40 mEq/L. For central administration, higher rates and concentrations may be used with extreme caution and continuous cardiac monitoring as per local protocol. ## Dose Adjustments * **Renal Impairment:** Use with caution. In severe renal impairment, potassium administration is generally contraindicated due to the risk of hyperkalemia. Dose reduction may be necessary. * **Hepatic Impairment:** No specific dose adjustments are typically required solely for hepatic impairment, but liver disease can affect potassium balance. ## Contraindications * Severe renal impairment. * Conditions where potassium levels are already elevated (e.g., hyperkalemia, anuria, oliguria). * Untreated Addison's disease. * Certain heart conditions (e.g., complete heart block). * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain, flatulence. * **Serious:** Hyperkalemia (symptoms include muscle weakness, fatigue, paresthesias, cardiac arrhythmias, cardiac arrest), gastrointestinal ulceration, bleeding, or perforation (especially with sustained-release oral formulations or rapid IV infusion). ## Key Drug Interactions * **ACE Inhibitors and ARBs:** Increase the risk of hyperkalemia. * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Significantly increase the risk of hyperkalemia. * **NSAIDs:** May reduce the effectiveness of potassium and increase the risk of hyperkalemia. * **Digoxin:** High potassium levels can decrease the efficacy of digoxin; low potassium levels can increase the risk of digoxin toxicity. * **Corticosteroids:** Can potentiate potassium loss. ## Monitoring * **Serum potassium levels:** Monitor frequently, especially during IV therapy, rapid dose increases, or in patients with renal impairment. * **Electrocardiogram (ECG):** Essential for patients receiving IV potassium, particularly at higher rates or concentrations, or in those with severe hypokalemia or risk factors for cardiac complications. * **Renal function:** Monitor serum creatinine and BUN. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride should be taken with meals or fluids to minimize gastrointestinal upset. * Dilute concentrated oral solutions before administration. * Never administer IV potassium chloride undiluted or as an IV push. * Rapid IV administration of potassium can be fatal due to cardiac effects. * The risk of gastrointestinal ulceration with oral potassium chloride is higher with sustained-release formulations and may be exacerbated by concurrent use of NSAIDs or alcohol. * Consider the total daily intake of potassium from all sources (diet, other medications). *** *This information is intended for clinical use and does not substitute for professional medical advice. Always verify the most current prescribing information with official drug references.*