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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 formulations. ## Primary Indications * Prevention and treatment of hypokalemia. * Used in conjunction with diuretics that cause potassium loss. ## Adult Dosing * **Oral Prevention:** Typically 20 mEq (1000 mg) to 40 mEq (2000 mg) per day, divided into 1-2 doses. * **Oral Treatment:** Doses can range from 40 mEq (2000 mg) to 100 mEq (5000 mg) per day, divided into 2-4 doses, depending on severity. Maximum daily dose is generally 200 mEq (10,000 mg) per day. * **Intravenous (IV) Treatment:** * Mild to moderate hypokalemia (serum K+ 3.0-3.4 mEq/L): 20-40 mEq diluted in 1 L of IV fluid, infused over 4-10 hours. * Severe hypokalemia (serum K+ < 2.5 mEq/L): May require higher doses, up to 40 mEq per dose, infused more rapidly (e.g., 10-20 mEq/hour) in critical care settings, often with continuous cardiac monitoring. Maximum infusion rate is generally 10-20 mEq/hour; rates up to 40 mEq/hour may be used in life-threatening situations with strict cardiac monitoring. Maximum dose per infusion is typically 40 mEq, but can be higher in emergency situations. ## Pediatric Dosing * **Oral Prevention/Treatment:** 1-2 mEq/kg/day, divided into 1-4 doses. Maximum daily dose is generally 3 mEq/kg/day or 200 mEq/day, whichever is less. * **Intravenous (IV) Treatment:** 0.5-1 mEq/kg per dose, diluted in IV fluid and infused over 1-3 hours. Maximum infusion rate is typically 0.5-1 mEq/kg/hour, not to exceed 20 mEq/hour in neonates. Maximum dose per day is generally 3 mEq/kg/day or 200 mEq/day, whichever is less. *Note: Specific pediatric dosing may depend on local protocols and the child's condition.* ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Reduce dose and monitor serum potassium closely. In severe renal impairment, potassium supplementation may be contraindicated. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia (e.g., severe renal impairment, untreated Addison's disease, certain types of heart block). * Gastrointestinal obstruction or delayed gastric emptying. ## Adverse Effects * **Most Serious:** Hyperkalemia (muscle weakness, paralysis, cardiac arrhythmias, cardiac arrest). * **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal pain, GI bleeding or perforation (especially with undiluted or sustained-release formulations). * **Cardiovascular:** Arrhythmias, ECG changes. * **Other:** Phlebitis (IV). ## 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 potassium excretion, increasing risk of hyperkalemia. * **Digoxin:** Hypokalemia increases digoxin toxicity; hyperkalemia reduces digoxin efficacy. ## Monitoring * **Serum Potassium:** Frequently monitor, especially with IV administration, rapid infusions, renal impairment, or concurrent interacting medications. * **Renal function (BUN, creatinine):** Assess baseline and periodically during therapy. * **ECG:** Especially in patients receiving IV potassium, rapid infusions, or with underlying cardiac disease. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride can be irritating to the GI tract. It should be administered with food or a large glass of water to minimize irritation. * Extended-release formulations can cause pill esophagitis; ensure adequate fluid intake. * Intravenous potassium chloride must be diluted before administration. Never administer as an IV bolus. * Rapid IV infusion of potassium can be fatal. Use caution and cardiac monitoring, especially in patients with cardiac disease or renal impairment. * When treating severe hypokalemia, it is crucial to assess magnesium levels, as magnesium deficiency can impair potassium repletion. *** *Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information and relevant guidelines for complete and up-to-date details before making clinical decisions.*