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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 * Treatment and prevention of hypokalemia. * Potassium supplementation in patients receiving diuretic therapy or corticosteroids. ## Adult Dosing * **Oral:** * Prevention: 20 mEq (1.5 g KCl) once to twice daily. * Treatment: 40-100 mEq (3-7.5 g KCl) daily, divided into 2-4 doses. * Maximum daily dose generally **should not exceed 150-200 mEq** unless under strict monitoring due to risk of hyperkalemia. * Extended-release formulations: Dosing varies by product; follow manufacturer guidance. Common doses range from 8 mEq to 20 mEq daily. * **Intravenous (IV):** * **Mild Hypokalemia (serum K < 3.0 mEq/L):** 10-20 mEq (0.75-1.5 g KCl) administered over several hours (e.g., 2-4 hours). * **Moderate Hypokalemia (serum K 2.5-3.0 mEq/L):** 20-40 mEq (1.5-3 g KCl) administered over several hours. * **Severe Hypokalemia or Cardiac Arrhythmias (serum K < 2.5 mEq/L):** Up to 80-100 mEq (6-7.5 g KCl) may be administered daily, often in divided doses. * **Maximum infusion rate:** * Peripheral line: **10 mEq/hour (0.75 g/hour)**. * Central line: **Up to 20 mEq/hour (1.5 g/hour)** in severe, symptomatic hypokalemia with continuous ECG monitoring. * **Concentration:** * Peripheral IV: Typically **not to exceed 40 mEq/L (3 g/L)** to minimize phlebitis. * Central IV: May use higher concentrations, up to **80 mEq/L (6 g/L)**, under close supervision. ## Pediatric Dosing * Dosing is highly individualized based on serum potassium levels, clinical status, and age/weight. Local protocol should be followed. * **General Guidelines:** * Oral: 1-3 mEq/kg/day, divided into doses. Maximum daily dose not to exceed 100 mEq (7.5 g KCl). * IV: * Maintenance: 0.5-2 mEq/kg/day. * Repletion: May require higher doses, up to 3-4 mEq/kg/day, administered slowly and with careful monitoring. * **Maximum infusion rate:** Generally **0.5-1 mEq/kg/hour (max 20 mEq/hour or 1.5 g/hour)** depending on the clinical situation and route of administration. * **Concentration:** Similar restrictions to adults based on route of administration (peripheral vs. central line). ## Dose Adjustments * **Renal Impairment:** Dose must be reduced. Monitor potassium levels closely. Avoid potassium-containing supplements in severe renal impairment. * **Adrenal Insufficiency:** Increased risk of hyperkalemia. ## Contraindications * Hyperkalemia (serum K > 5.0 mEq/L). * Conditions that predispose to hyperkalemia (e.g., untreated Addison's disease, severe renal impairment, certain medications). * Gastrointestinal obstruction or delayed gastric emptying. ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain. * **Serious:** * **Hyperkalemia:** Symptoms include muscle weakness, paresthesias, flaccid paralysis, cardiac arrhythmias, and cardiac arrest. * **GI Ulceration/Perforation:** Especially with oral extended-release formulations if not taken with sufficient fluid or if GI motility is impaired. * **Phlebitis/Extravasation:** With IV administration. ## Key Drug Interactions * **ACE Inhibitors and ARBs:** Increase risk of hyperkalemia. * **Potassium-Sparing Diuretics (e.g., spironolactone, amiloride, triamterene):** Increase risk of hyperkalemia. * **NSAIDs:** May impair potassium excretion, increasing risk of hyperkalemia. * **Heparin:** Can inhibit aldosterone production, increasing risk of hyperkalemia. * **Digoxin:** Toxicity risk is increased in hypokalemia; however, correction of hypokalemia can increase digoxin toxicity if potassium levels become too high. ## Monitoring * **Serum Potassium Levels:** Frequently, especially during IV therapy, with dose adjustments, or in patients with renal impairment. * **Renal Function (BUN, Creatinine):** Essential for dose adjustments. * **ECG:** For signs of hyperkalemia (peaked T waves, widening QRS). * **Urine Output:** To assess renal perfusion and ability to excrete potassium. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Always dilute IV potassium chloride. Never administer as a direct IV push. * Administer oral potassium chloride with food or a full glass of water to minimize GI irritation. * Monitor ECG closely when administering IV potassium, especially at higher rates or concentrations. * Be aware that potassium correction may unmask or worsen digoxin toxicity. * Patients with diarrhea or vomiting are at risk for hypokalemia. * The "normal" serum potassium range can vary slightly by laboratory; however, < 3.5 mEq/L is generally considered hypokalemia. *** *Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering any medication. Clinical decisions should be based on individual patient assessment.*