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# Potassium Chloride ## Overview Potassium chloride (KCl) is an essential electrolyte used to prevent or treat hypokalemia. It is available in oral and intravenous (IV) formulations. ## Primary Indications * Prevention and treatment of hypokalemia. * Potassium replacement in patients with or at risk for hypokalemia (e.g., diuretic use, vomiting, diarrhea, certain gastrointestinal disorders). ## Adult Dosing * **Prevention of hypokalemia:** 20 mEq (1.5 g) daily, divided into 1-2 doses. * **Treatment of hypokalemia:** * Mild to moderate hypokalemia (serum K+ 3.0-3.5 mEq/L): 40-100 mEq (3-7.5 g) daily, divided into 2-4 doses. * Severe hypokalemia (serum K+ <3.0 mEq/L): Dosing depends on severity and patient condition. Often initiated with IV administration. Oral doses can range from 10-20 mEq (0.75-1.5 g) per dose, not to exceed 20 mEq (1.5 g) per dose or 100 mEq (7.5 g) per day without continuous ECG monitoring. * **IV administration:** Dosing varies significantly based on serum potassium levels and cardiac monitoring availability. * *General replacement:* Typically 20-40 mEq (1.5-3 g) added to 1 Liter of IV fluid per 24 hours. * *Severe hypokalemia (serum K+ <2.5 mEq/L) with ECG changes:* May require up to 40 mEq/hour, administered via a central line with continuous cardiac monitoring. **Maximum infusion rate typically should not exceed 10-20 mEq/hour (unless in a critical care setting with continuous ECG monitoring, where rates up to 40 mEq/hour may be used).** * **Maximum single dose (IV):** Generally limited to 40 mEq (3 g) per infusion bag, with a maximum of 3 bags (120 mEq) in 24 hours, especially if infused peripherally. Central line administration for higher doses is preferred. ## Pediatric Dosing * **Maintenance:** 1-2 mEq/kg/day, not to exceed adult maximums. * **Correction:** Dosing is highly individualized based on serum potassium, clinical status, and age. Oral doses typically range from 0.5-2 mEq/kg/day divided into multiple doses. IV doses are administered with extreme caution and close monitoring. * **IV infusion rates:** Generally limited to 0.5-1 mEq/kg/hour, not to exceed 20 mEq/hour, with continuous cardiac monitoring. ## Dose Adjustments * **Renal impairment:** Dose reduction is necessary. Monitor potassium levels closely. In severe renal impairment, potassium supplementation may be contraindicated. * **Adrenal insufficiency:** Patients may be more sensitive to potassium effects. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia, such as severe renal impairment, untreated Addison's disease, crush syndrome, severe burns, and certain cardiac conditions (e.g., complete heart block without a pacemaker). * Known hypersensitivity to potassium chloride. ## Adverse Effects * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal discomfort, gastrointestinal bleeding (especially with sustained-release formulations). * **Cardiovascular:** Arrhythmias, cardiac arrest (with rapid IV infusion or hyperkalemia). * **Other:** Hyperkalemia, hyperchloremic acidosis. ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **ACE inhibitors and ARBs:** Increased risk of hyperkalemia. * **NSAIDs:** May reduce the kaliuretic effect of potassium, increasing risk of hyperkalemia. * **Heparin:** Can impair potassium excretion and increase the risk of hyperkalemia. * **Digoxin:** Hypokalemia enhances digoxin toxicity; conversely, hyperkalemia reduces digoxin's therapeutic effect. ## Monitoring * Serum potassium levels (frequent monitoring, especially during IV administration and dose adjustments). * Renal function (BUN, creatinine). * ECG (especially with rapid IV infusion, severe hypokalemia, or risk factors for cardiac arrhythmias). * Signs and symptoms of hypokalemia and hyperkalemia. ## Clinical Pearls * Oral potassium chloride should be taken with meals or after food to minimize gastrointestinal upset. * Dilute oral liquid potassium chloride in a sufficient amount of fluid (e.g., 4-8 ounces) to improve palatability and reduce esophageal irritation. * IV potassium chloride must be diluted and administered slowly. **Never administer IV potassium chloride as an undiluted IV push.** * Sustained-release formulations may reduce GI side effects but can still cause irritation or obstruction. * Rapid IV administration of potassium is dangerous and can be fatal. *** *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 local protocols for definitive guidance.*