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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. * Treatment of specific types of metabolic alkalosis. ## Adult Dosing **Oral:** * **Prevention:** 20 mEq (1.5 g) daily to 40 mEq (3 g) daily, divided into 1-2 doses. * **Treatment:** 40 mEq (3 g) to 100 mEq (7.5 g) daily, divided into 2-4 doses. **Intravenous (IV):** * **For mild hypokalemia (serum K 3.0-3.4 mEq/L):** 20 mEq infused over 1-2 hours. * **For moderate hypokalemia (serum K 2.5-2.9 mEq/L):** 40 mEq infused over 2-4 hours. * **For severe hypokalemia (serum K < 2.5 mEq/L):** May require higher doses and more rapid infusion, but typically administered in increments of 10-20 mEq/hour. **Maximum IV infusion rate:** Generally 10 mEq/hour peripherally and 20 mEq/hour centrally, unless severe and life-threatening, in which case it may be increased to 40 mEq/hour with continuous cardiac monitoring. **Maximum single IV dose:** Typically 20-40 mEq, but higher doses may be necessary under close medical supervision. **Maximum daily IV dose:** Generally not to exceed 200 mEq/24 hours, but higher doses may be required in critical situations. Dosing may vary based on the severity of hypokalemia, ongoing potassium losses, and patient response. Local protocols should be consulted for specific IV administration guidelines. ## Pediatric Dosing **Oral:** * **Prevention:** 1-2 mEq/kg/day, not to exceed 3 g/day. * **Treatment:** 2-5 mEq/kg/day, divided into 2-4 doses. **Intravenous (IV):** * **General maintenance:** 1-2 mEq/kg/day, not to exceed 20 mEq/day. * **Correction of hypokalemia:** 0.5-1 mEq/kg/dose, infused over 1-3 hours. **Maximum IV infusion rate:** 0.5 mEq/kg/hour, not to exceed 20 mEq/hour. **Maximum single IV dose:** 1 mEq/kg, not to exceed 10 mEq/dose. Individualized dosing is crucial in pediatric patients, especially neonates, due to their altered electrolyte and fluid balance. ## Dose Adjustments * **Renal impairment:** Dose reduction is essential. Potassium is primarily excreted by the kidneys. Monitor serum potassium closely. Avoid in severe renal insufficiency. * **Adrenal insufficiency:** Increased sensitivity to potassium. * **Elderly:** May have reduced renal function, requiring dose adjustment. ## Contraindications * Hyperkalemia. * Conditions that predispose to hyperkalemia, such as anuria, severe renal insufficiency, untreated Addison's disease, and certain types of chronic dehydration. * Intestinal obstruction or delayed gastric emptying. * Potassium chloride injections for intravenous use are contraindicated. ## Adverse Effects * **Gastrointestinal (oral):** Nausea, vomiting, abdominal pain, diarrhea, flatulence. Esophageal or gastric irritation/perforation (especially with undissolved tablets). * **Cardiovascular (IV):** Hyperkalemia, arrhythmias, cardiac arrest (especially with rapid IV infusion or in patients with renal impairment). Hypotension. * **Other:** Vein irritation, phlebitis (IV). ## 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 reduce the potassium-lowering effects of potassium supplements and increase the risk of hyperkalemia. * **Heparin:** May increase the risk of hyperkalemia. * **Salt substitutes:** Often contain potassium chloride, leading to increased potassium intake and potential for hyperkalemia. * **Digoxin:** Hypokalemia potentiates digoxin toxicity. Conversely, hyperkalemia reduces digoxin's effect. ## Monitoring * **Serum potassium levels:** Frequently monitor, especially during IV therapy, with dose changes, or in patients with renal impairment. * **ECG:** Essential for patients receiving IV potassium, particularly rapid infusions or high doses, to detect signs of hyperkalemia (e.g., peaked T waves, widened QRS complex). * **Renal function:** Monitor BUN and creatinine. * **Fluid balance:** Monitor intake and output. * **Signs and symptoms of hypokalemia and hyperkalemia.** ## Clinical Pearls * Oral potassium chloride should be taken with meals or a full glass of water to minimize gastrointestinal irritation. * For IV administration, always dilute potassium chloride in a compatible IV fluid. * Never administer potassium chloride as an IV push injection. * Be aware of the significant risk of fatal hyperkalemia with IV potassium administration, especially in patients with impaired renal function. * Consider the total potassium load from all sources, including diet and other medications. --- **Disclaimer:** This information is intended for healthcare professionals and does not replace comprehensive prescribing information. Always consult the most current official drug monograph and local protocols before prescribing or administering any medication.