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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 of hypokalemia.
* Prevention of hypokalemia in patients at risk.
## Adult Dosing
* **Oral:** Dosing varies based on serum potassium levels and clinical indication. Typical maintenance doses range from 10-20 mEq per day, divided into 1-3 doses. For documented hypokalemia, doses can range from 20-100 mEq per day, divided as needed, not to exceed 20 mEq in a single oral dose.
* **Intravenous (IV):** Dosing depends on serum potassium level and severity of deficiency.
* **Mild hypokalemia (serum K 3.0-3.4 mEq/L):** 10-20 mEq added to 1 liter of IV fluid, infused over 1-2 hours.
* **Moderate hypokalemia (serum K 2.5-2.9 mEq/L):** 20-40 mEq added to 1 liter of IV fluid, infused over 2-4 hours.
* **Severe hypokalemia (serum K < 2.5 mEq/L):** 40-60 mEq added to 1 liter of IV fluid, infused over 2-4 hours, or higher doses as per local protocol.
* **Maximum IV infusion rate:** Generally 10-20 mEq/hour; rates exceeding 10 mEq/hour require continuous cardiac monitoring.
* **Maximum concentration:** Typically 40 mEq/L for peripheral IVs and 80 mEq/L for central IVs to avoid phlebitis and extravasation. Higher concentrations may be used in critical care settings with central access and continuous monitoring, per local protocol.
## Pediatric Dosing
* **Oral:** Doses range from 1-2 mEq/kg/day, divided into 1-4 doses, not to exceed 10 mEq per dose.
* **Intravenous (IV):** Doses range from 0.5-1 mEq/kg per dose, not to exceed 10 mEq per dose, infused over 1-3 hours. Higher doses may be administered in critical care with appropriate monitoring as per local protocol.
* **Maximum IV infusion rate:** Generally 0.5-1 mEq/kg/hour, not to exceed 20 mEq/hour.
## Dose Adjustments
* **Renal Impairment:** Use with extreme caution. Reduce dose and monitor potassium levels closely. Avoid in severe renal impairment.
## Contraindications
* Hyperkalemia.
* Conditions that predispose to hyperkalemia, such as:
* Untreated Addison's disease.
* Acute dehydration.
* Extensive tissue injury or burns.
* Certain renal disorders.
* Certain medications known to cause hyperkalemia (see Drug Interactions).
## Adverse Effects
* **Common:** Nausea, vomiting, abdominal discomfort, diarrhea (oral). Pain, phlebitis, or infiltration at IV site.
* **Serious:** Hyperkalemia, cardiac arrhythmias, cardiac arrest, ECG changes (peaked T waves, flattened P waves, prolonged QRS).
## Key Drug Interactions
* **ACE inhibitors, ARBs, Potassium-sparing diuretics (e.g., spironolactone, amiloride), NSAIDs, Heparin, Trimethoprim:** Increased risk of hyperkalemia. Monitor potassium closely.
* **Aldosterone antagonists:** May decrease potassium.
* **Insulin:** May temporarily lower serum potassium.
## Monitoring
* Serum potassium levels, especially during initiation, dose changes, or in patients with renal impairment.
* Renal function (BUN, creatinine).
* ECG monitoring for patients receiving rapid IV infusions or with risk factors for hyperkalemia.
* Signs and symptoms of hypokalemia (weakness, fatigue, constipation, arrhythmias) and hyperkalemia (muscle weakness, paresthesias, cardiac arrhythmias).
## Clinical Pearls
* Administer oral potassium chloride with food or a full glass of water to minimize gastrointestinal upset.
* Dilute IV potassium chloride appropriately before administration. Never administer as an undiluted IV bolus due to the high risk of cardiac arrest.
* Consider the potassium content of other IV fluids and medications.
* Always verify the correct product (e.g., KCL vs. other potassium salts) and formulation before administration.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete and up-to-date details before making clinical decisions.
