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# Potassium Chloride
## Overview
Potassium chloride (KCl) is an electrolyte replacement used to treat or prevent hypokalemia. It is available in oral and intravenous formulations.
## Primary Indications
* Treatment and prevention of hypokalemia.
* Prevention of arrhythmias in patients with digitalis toxicity.
## Adult Dosing
* **Prevention of hypokalemia:** 20 mEq (1.5 g) orally once daily.
* **Treatment of hypokalemia:** 40-100 mEq (3-7.5 g) orally daily, divided into 2-4 doses. Oral doses > 20 mEq/day should be given in divided doses.
* **Intravenous administration:** Dosing depends on serum potassium levels and clinical status.
* **Mild hypokalemia (serum K+ 3.0-3.5 mEq/L):** 10-20 mEq (0.75-1.5 g) KCl diluted in 1 L of IV fluid, infused over 1-2 hours.
* **Moderate hypokalemia (serum K+ 2.5-2.9 mEq/L):** 20-40 mEq (1.5-3 g) KCl diluted in 1 L of IV fluid, infused over 2-4 hours.
* **Severe hypokalemia (serum K+ < 2.5 mEq/L):** 40-80 mEq (3-6 g) KCl diluted in 1 L of IV fluid, infused over 4-8 hours.
* **Maximum intravenous infusion rate:** Generally 10-20 mEq/hour. Faster rates (up to 40 mEq/hour) may be used in life-threatening situations with continuous cardiac monitoring, but carry increased risk of cardiac arrest.
* **Maximum single intravenous dose:** 40 mEq (3 g) in a 1 L bag.
## Pediatric Dosing
* **Prevention of hypokalemia:** 1-2 mEq/kg/day orally, divided into 1-2 doses.
* **Treatment of hypokalemia:** 2-5 mEq/kg/day orally, divided into 2-4 doses.
* **Intravenous administration:** Generally 0.5-1 mEq/kg per dose, not to exceed 20 mEq per dose, infused at a rate not exceeding 0.02-0.04 mEq/kg/minute. Specific protocols should be followed.
## Dose Adjustments
* No specific dose adjustments for hepatic or renal impairment, but caution is advised due to potential for hyperkalemia.
## Contraindications
* Hyperkalemia.
* Conditions which may lead to the development of hyperkalemia, such as severe renal impairment, untreated Addison's disease, acute dehydration, strenuous muscular exertion, extensive tissue breakdown (as in severe burns or trauma), or the administration of potassium-sparing diuretics.
## Adverse Effects
* **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal pain, gastric irritation, ulceration, bleeding.
* **Cardiovascular:** Arrhythmias, hypotension (especially with rapid IV infusion), cardiac arrest.
* **Other:** Hyperkalemia, hyperchloremic acidosis.
## Key Drug Interactions
* **ACE inhibitors, ARBs, potassium-sparing diuretics, NSAIDs, heparin, trimethoprim:** Increased risk of hyperkalemia.
* **Digitalis glycosides:** Potassium can antagonize the effects of digitalis. Maintain serum potassium within the normal range.
* **Beta-adrenergic blockers:** May increase serum potassium.
## Monitoring
* Serum electrolytes (especially potassium) before and during treatment.
* Renal function.
* ECG for signs of hyperkalemia (peaked T waves, flattened P waves, prolonged PR interval, widening QRS complex).
* Signs and symptoms of hypokalemia and hyperkalemia.
## Clinical Pearls
* Oral potassium chloride should be taken with meals or after meals to minimize gastrointestinal upset.
* Dilute concentrated oral solutions (e.g., liquid KCl) before administration.
* Intravenous potassium chloride is a vesicant and should be administered through a patent IV line, preferably a central line for concentrations > 40 mEq/L or rapid infusions.
* Rapid intravenous administration can be fatal.
* Hypokalemia associated with diarrhea or vomiting requires aggressive replacement.
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*This information is intended for healthcare professionals. Always consult the current prescribing information and institutional protocols for complete details and to verify the most up-to-date recommendations.*
