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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, particularly in patients receiving diuretics or other medications that deplete potassium. ## Adult Dosing * **Oral:** * **Treatment of Hypokalemia:** Typically 20-100 mEq per day in 2-4 divided doses. Individualize dose based on serum potassium levels and patient response. Maximum daily dose is generally considered 200 mEq. * **Prevention of Hypokalemia:** Typically 20-40 mEq per day. * **Extended-release formulations:** Doses vary by product, follow manufacturer labeling. * **Intravenous (IV):** * **Treatment of Hypokalemia:** * **Mild to Moderate (Serum K+ 2.5-3.5 mEq/L):** 20-40 mEq infused over 2-6 hours. Total daily dose usually 100-200 mEq. * **Severe (Serum K+ < 2.5 mEq/L or symptomatic):** Can administer up to 20-30 mEq/hour via a central venous catheter, with cardiac monitoring. **Caution:** Rapid infusion can be fatal. Total daily dose usually 100-200 mEq. * **Concentration Limits:** For peripheral administration, generally limit to 40 mEq/L. For central administration, can go up to 100 mEq/L, but requires close monitoring and central access. * **Local protocol:** Specific infusion rates and maximum concentrations may vary based on institutional guidelines and patient clinical status. ## Pediatric Dosing * **Oral:** * **Treatment of Hypokalemia:** 2-5 mEq/kg/day in 2-4 divided doses. Maximum daily dose generally 20 mEq/kg/day or 200 mEq/day, whichever is less. * **Prevention of Hypokalemia:** 1 mEq/kg/day. * **Intravenous (IV):** * **Treatment of Hypokalemia:** Typically 0.5-1 mEq/kg per dose, infused over 1-3 hours. Maximum concentration usually 40 mEq/L. Maximum infusion rate is generally 10-20 mEq/hour. * **Local protocol:** Specific dosing and infusion parameters must be individualized and follow strict institutional guidelines due to the risk of hyperkalemia and cardiac arrhythmias. ## Dose Adjustments * **Renal Impairment:** Use with caution. Dose reduction may be necessary. Monitor serum potassium closely. IV potassium should be avoided if possible in severe renal impairment. * **Adrenal Insufficiency:** Increased risk of hyperkalemia. ## Contraindications * Hyperkalemia (serum potassium > 5 mEq/L). * Conditions where potassium levels are likely to rise, such as severe renal impairment, untreated Addison's disease, severe burns, or extensive tissue injury. * Certain patients with heart block or delayed ventricular emptying. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal discomfort. * **Serious:** Hyperkalemia (muscle weakness, paresthesias, paralysis, cardiac arrhythmias, cardiac arrest), gastrointestinal ulceration, bleeding, or perforation (especially with sustained-release oral formulations). ## Key Drug Interactions * **ACE inhibitors, ARBs, Potassium-sparing diuretics, NSAIDs, Cyclosporine, Tacrolimus:** Increased risk of hyperkalemia. * **Digitalis glycosides:** Hyperkalemia may increase digitalis toxicity; hypokalemia may increase digitalis toxicity. * **Diuretics (loop, thiazide):** Can cause hypokalemia, necessitating potassium replacement. ## Monitoring * Serum potassium levels (prior to and during therapy, frequency depends on dose, route, and clinical status). * ECG monitoring, especially for IV administration or suspected hyperkalemia. * Renal function (serum creatinine, BUN). * Fluid and electrolyte balance. ## Clinical Pearls * Oral potassium supplements are often poorly tolerated due to gastrointestinal side effects. Sustained-release formulations may improve tolerability but carry a risk of GI ulceration. * Dilute oral potassium chloride before administration to improve palatability and reduce gastric irritation. * IV potassium chloride must be administered with extreme caution, especially rapid infusions, due to the risk of fatal cardiac arrhythmias. Always use an infusion pump. * Always confirm the serum potassium level before initiating IV potassium therapy, especially in critical patients. *** *This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions.*