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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. ## Adult Dosing * **Prevention of hypokalemia:** Typically 20 mEq (10 mmol) per day in divided doses. * **Treatment of hypokalemia:** Doses vary based on severity and serum potassium levels. Oral doses can range from 20 mEq (10 mmol) to 100 mEq (50 mmol) per day, often divided into 2-5 doses. Intravenous (IV) doses should not exceed 10 mEq (5 mmol) per hour for peripheral administration, and higher rates may be used with continuous cardiac monitoring in a monitored setting. The maximum daily IV dose is generally 400 mEq (200 mmol), but this may be adjusted based on patient response and electrolyte levels. Specific dosing protocols may vary by institution. ## Pediatric Dosing * **Prevention of hypokalemia:** 1-2 mEq/kg/day, not to exceed 20 mEq (10 mmol) per day. * **Treatment of hypokalemia:** 2-5 mEq/kg/day, not to exceed 40 mEq (20 mmol) per day, in divided doses. IV doses in pediatric patients should generally not exceed 0.5-1 mEq/kg/hour. Higher infusion rates require closer monitoring. Specific dosing often depends on local hospital protocols and serum potassium levels. ## Dose Adjustments * **Renal Impairment:** Use with caution and reduce dose as renal excretion is the primary route of elimination. Monitor serum potassium closely. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia, such as severe renal impairment, untreated Addison's disease, or conditions with impaired salt and water excretion. * History of GI obstruction or delayed gastric emptying. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain. * **Serious:** Hyperkalemia (can lead to cardiac arrhythmias, cardiac arrest), esophageal or gastric irritation/perforation (especially with sustained-release formulations or if not taken with sufficient fluid). ## Key Drug Interactions * **ACE inhibitors, ARBs, potassium-sparing diuretics, NSAIDs, cyclosporine, tacrolimus:** Increased risk of hyperkalemia. * **Potassium-containing salt substitutes:** Increased risk of hyperkalemia. * **Diuretics (loop, thiazide):** Can cause potassium loss, increasing the need for potassium supplementation. ## Monitoring * Serum potassium levels (frequency depends on dose, route, and clinical status). * Renal function (BUN, creatinine). * ECG (especially with IV administration or rapid dose increases). * Signs and symptoms of hyperkalemia (muscle weakness, paresthesias, irregular pulse). ## Clinical Pearls * Oral potassium chloride should be taken with meals and a full glass of water to minimize GI upset and esophageal irritation. * Sustained-release formulations may be associated with a higher risk of GI adverse events. * IV administration of potassium chloride is painful and should be administered through a large-bore IV catheter. * Never administer IV potassium chloride undiluted as a bolus due to the risk of fatal hyperkalemia and cardiac arrest. *** *Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information and relevant clinical guidelines for complete and up-to-date details before making clinical decisions.*