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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 * **Oral:** * Prevention: 20 mEq (1 mmol) once daily. * Treatment: 40-100 mEq (4-10 mmol) divided into 2-5 doses daily. Maximum daily oral dose is typically 200 mEq (20 mmol), but individualize based on serum potassium levels and clinical response. Doses exceeding 20 mEq (2 mmol) per dose should be administered with caution. * **Intravenous (IV):** * Dosing is highly individualized based on serum potassium level, severity of hypokalemia, and patient's clinical status. * **Mild to moderate hypokalemia (serum K 2.5-3.5 mEq/L):** Typically 10-20 mEq (1-2 mmol) added to a large volume of IV fluid (e.g., 1000 mL normal saline or dextrose 5% in water), infused over several hours. * **Severe hypokalemia (serum K < 2.5 mEq/L):** May require higher doses, up to 40 mEq (4 mmol) per liter of IV fluid, administered more rapidly. * **Maximum IV infusion rate:** Generally not to exceed 10-20 mEq (1-2 mmol) per hour in adults to avoid cardiac arrhythmias and phlebitis. Higher rates (e.g., 40 mEq/hour) may be used in life-threatening situations with continuous cardiac monitoring. * **Maximum concentration for peripheral IV infusion:** Typically limited to 40 mEq (4 mmol) per liter (0.004 mEq/mL) to reduce the risk of phlebitis and pain. * **Maximum concentration for central IV infusion:** Can be higher, up to 100 mEq (10 mmol) per liter (0.1 mEq/mL), but should be administered with caution and continuous monitoring. * Specific IV dosing protocols may vary by institution. ## Pediatric Dosing * **Oral:** * Prevention: 1-2 mEq/kg/day divided into 1-2 doses (maximum 10 mEq/day). * Treatment: 2-5 mEq/kg/day divided into 2-4 doses (maximum 40 mEq/day). * **Intravenous (IV):** * Dosing is highly individualized. A common guideline is 0.3-1 mEq/kg/dose (up to 40 mEq/dose) infused over 1-3 hours, depending on severity and rate of infusion. * Maximum infusion rate generally should not exceed 0.5 mEq/kg/hour. * Maximum concentration for peripheral infusion: 3 mEq/kg per 100 mL or 40 mEq/L. * Maximum concentration for central infusion: May be higher, up to 100 mEq/L, with caution. * Specific pediatric IV dosing protocols are essential and may vary by institution. ## Dose Adjustments * **Renal impairment:** Use with extreme caution. Potassium accumulation can lead to hyperkalemia. Lower doses and frequent monitoring of serum potassium are necessary. In severe renal impairment, potassium supplementation may be contraindicated. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia, such as severe renal impairment or untreated Addison's disease. * Certain gastrointestinal conditions (e.g., esophageal obstruction, delayed gastric emptying) may contraindicate oral formulations. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain (oral). Pain, phlebitis, venous irritation (IV). * **Serious:** Hyperkalemia (muscle weakness, fatigue, paresthesias, cardiac arrhythmias, cardiac arrest), gastrointestinal ulceration or perforation (especially with sustained-release oral formulations). ## Key Drug Interactions * **ACE inhibitors, ARBs, potassium-sparing diuretics, NSAIDs, certain immunosuppressants (e.g., cyclosporine, tacrolimus):** Increase the risk of hyperkalemia. * **Potassium-containing salt substitutes:** Can significantly increase potassium intake and risk of hyperkalemia. * **Digoxin:** Hypokalemia can potentiate digoxin toxicity; conversely, hyperkalemia can reduce digoxin's therapeutic effect. ## Monitoring * Serum potassium levels: Frequently monitor, especially during IV administration, dose adjustments, and in patients with renal impairment. * Renal function (BUN, creatinine). * ECG: Particularly important with IV potassium administration, especially at higher doses or infusion rates, to detect signs of hyperkalemia (e.g., peaked T waves). * Signs and symptoms of hypokalemia and hyperkalemia. ## Clinical Pearls * Always dilute IV potassium chloride before administration to prevent severe adverse events. * Oral potassium chloride should be taken with meals or a full glass of water to minimize gastrointestinal irritation. * Sustained-release oral formulations may reduce gastrointestinal side effects but can still cause ulceration. * Rapid IV infusion of potassium chloride can be dangerous and should only be performed in critical situations with continuous cardiac monitoring. * Ensure adequate magnesium levels, as hypomagnesemia can contribute to refractory hypokalemia. *** *This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols before administering any medication.*