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# Potassium Chloride ## Overview Potassium chloride (KCl) is an electrolyte replacement used to treat or prevent hypokalemia. It is available in oral and intravenous (IV) formulations. ## Primary Indications * Treatment of hypokalemia. * Prevention of hypokalemia in patients at risk. ## Adult Dosing **Oral:** * **Treatment of hypokalemia:** Typically 40-100 mEq per day divided into 2-4 doses. Maximum daily dose is generally 200 mEq. * **Prevention of hypokalemia:** Typically 20-40 mEq per day in 1-2 doses. **Intravenous:** * **Treatment of hypokalemia:** Usual dose is 10-20 mEq per hour. The maximum recommended infusion rate is 20 mEq/hour and a maximum concentration of 40 mEq/L to minimize cardiac risk, *unless* the patient is in a monitored setting and experiencing life-threatening hypokalemia where higher rates (up to 40 mEq/hour) may be used under continuous cardiac monitoring. Total daily dose rarely exceeds 200 mEq. * **Specific IV dosing for severe hypokalemia or cardiac arrhythmias:** Dosing is highly individualized and dependent on serum potassium levels, ECG findings, and clinical status. Often guided by local protocol. Doses of 20-40 mEq may be given rapidly IV bolus in emergent situations with continuous cardiac monitoring. ## Pediatric Dosing **Oral:** * **Treatment of hypokalemia:** 2-5 mEq/kg/day divided into 2-4 doses. Maximum daily dose is generally 200 mEq. * **Prevention of hypokalemia:** 1-2 mEq/kg/day divided into 1-2 doses. **Intravenous:** * **Treatment of hypokalemia:** 0.5-1 mEq/kg infused over 1 hour. Maximum infusion rate is 10-20 mEq/hour. Maximum concentration typically 40 mEq/L. Higher rates (up to 40 mEq/hr) and concentrations (up to 80 mEq/L) can be used in emergent situations with continuous cardiac monitoring and may be guided by local protocol. ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Potassium is renally excreted, and impaired renal function significantly increases the risk of hyperkalemia. Dose reduction or discontinuation may be necessary. ## Contraindications * Hyperkalemia (serum potassium >5 mEq/L). * Conditions causing indiscriminate release of potassium (e.g., severe tissue trauma, extensive burns, adrenal insufficiency). * Certain types of heart block. * Anuria, oliguria, or azotemia. ## Adverse Effects * **Most Serious:** Hyperkalemia, cardiac arrhythmias, cardiac arrest, hypotension. * **Gastrointestinal (Oral):** Nausea, vomiting, diarrhea, abdominal pain, GI ulceration/bleeding (especially with sustained-release formulations). * **Venous Irritation (IV):** Phlebitis, pain at injection site. ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia. * **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), NSAIDs, Cyclosporine, Tacrolimus:** Increased risk of hyperkalemia. * **Aldosterone antagonists:** Increased risk of hyperkalemia. * **Digoxin:** Hyperkalemia can decrease digoxin's effectiveness and increase toxicity; hypokalemia increases digoxin toxicity. ## Monitoring * **Serum potassium levels:** Monitor frequently, especially during IV administration or dose changes. * **Renal function:** Monitor BUN and creatinine. * **ECG:** Monitor for changes indicative of hyperkalemia (e.g., peaked T waves, widened QRS complex). * **Urine output:** Ensure adequate renal function. * **Signs and symptoms of hyperkalemia:** Weakness, paresthesias, fatigue, bradycardia. ## Clinical Pearls * Oral potassium chloride should be taken with meals or a full glass of water to minimize GI irritation. * Sustained-release oral formulations can reduce GI irritation but may have variable absorption. * IV potassium chloride is a vesicant and must be infused cautiously. Never give IV push. * Hypokalemia can potentiate digoxin toxicity and mask its cardiac effects. * In patients with renal insufficiency, potassium supplementation requires very careful monitoring due to the high risk of hyperkalemia. *** *This information is intended for healthcare professionals. Always consult the most current prescribing information or a reliable drug information resource before making clinical decisions.*