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# Potassium Chloride ## Overview Potassium chloride (KCL) is an electrolyte supplement used to prevent and treat hypokalemia. It is available in oral and intravenous formulations. ## Primary Indications * Treatment and prevention of hypokalemia. * Replacement of potassium in patients receiving potassium-wasting diuretics. ## Adult Dosing * **Oral:** * **Prevention:** 20 mEq (1.5 g) once daily. * **Treatment:** 40-100 mEq (3-7.5 g) per day, divided into 2-4 doses. Doses should not exceed 20 mEq per single dose. * Maximum daily oral dose: 160 mEq (12 g). * **Intravenous:** * **Treatment:** Typically administered at 10-20 mEq per hour. * Concentrations: Typically do not exceed 40 mEq/L in peripheral lines, and 60 mEq/L in central lines, to avoid phlebitis. * Maximum rate: Generally 20 mEq/hour, but rates up to 40 mEq/hour may be used in life-threatening hypokalemia under continuous ECG monitoring. * Maximum single dose (peripheral): 10 mEq. * Maximum total daily dose: Varies based on clinical status and electrolyte levels, but often limited to 200 mEq. *Note: Exact dosing, rate of infusion, and maximum concentrations/doses for IV administration should be guided by local hospital protocols and patient-specific electrolyte levels and clinical condition.* ## Pediatric Dosing * **Oral:** * **Maintenance:** 2-5 mEq/kg/day, divided into 2-4 doses. * Maximum daily dose: 20 mEq/day for infants, 40 mEq/day for children. * **Intravenous:** * **Treatment:** 0.5-1 mEq/kg per dose, administered slowly. * Maximum rate: Typically 0.5-1 mEq/kg/hour, not to exceed 20 mEq/hour. * Maximum concentration: 40 mEq/L. * Maximum daily dose: 100 mEq/day. *Note: Pediatric IV dosing requires careful calculation and frequent monitoring. Consult pediatric-specific guidelines or protocols.* ## Dose Adjustments * **Renal Impairment:** Use with extreme caution. Potassium accumulation can occur. Monitor serum potassium closely. Dose reduction is usually necessary. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia (e.g., severe renal impairment, untreated Addison's disease, severe tissue trauma). * Certain types of heart block. * Use of potassium-sparing diuretics concurrently without careful monitoring. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain. * **Serious:** Hyperkalemia (symptoms include muscle weakness, paresthesia, paralysis, cardiac arrhythmias, cardiac arrest). Extravasation of IV potassium can cause severe tissue damage and necrosis. ## 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 impair potassium excretion, increasing risk of hyperkalemia. * **Digitalis glycosides:** Hyperkalemia can increase the toxicity of digitalis. Hypokalemia can potentiate digitalis toxicity. * **Anticholinergics:** May slow GI transit time, potentially increasing the risk of localized GI irritation or ulceration with oral potassium. ## Monitoring * **Serum electrolytes:** Especially potassium, sodium, and chloride. * **Renal function:** Serum creatinine and BUN. * **Cardiac monitoring:** ECG, particularly with rapid IV infusions or in patients with cardiac disease or risk factors for arrhythmias. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride, especially in solid dosage forms (tablets, capsules), can cause GI irritation, ulceration, or bleeding. Administer with food or fluid. * IV potassium is a high-alert medication. Double-check orders and concentrations. * Always dilute IV potassium before administration. Never administer as a bolus. * In hypokalemic patients on digitalis, it is crucial to maintain serum potassium in the normal range (typically 4.0-5.0 mEq/L) to avoid digitalis toxicity. *** **Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details before making any treatment decisions.