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# Potassium Chloride
## Overview
Potassium chloride (KCL) is an electrolyte replacement used to treat or prevent hypokalemia.
## Primary Indications
* Treatment of hypokalemia (serum potassium < 3.5 mEq/L).
* Prevention of hypokalemia in patients at risk.
## Adult Dosing
* **Treatment of hypokalemia:** Oral doses typically range from 20 mEq to 100 mEq per day, divided into 2-4 doses. Intravenous (IV) doses are highly variable based on severity and clinical setting.
* Mild hypokalemia (3.0-3.4 mEq/L): Oral 40-100 mEq/day.
* Moderate hypokalemia (2.5-2.9 mEq/L): Oral 80-120 mEq/day or IV.
* Severe hypokalemia (< 2.5 mEq/L): IV therapy is generally preferred, often starting with 10-20 mEq/hour. **Maximum IV infusion rates should not exceed 20 mEq/hour unless in a critical care setting with continuous cardiac monitoring, where rates up to 40 mEq/hour may be used. Central venous access is preferred for IV administration.**
* **Prevention of hypokalemia:** Oral doses typically range from 20 mEq to 40 mEq per day.
## Pediatric Dosing
* Pediatric dosing is highly individualized and depends on serum potassium levels, age, weight, and clinical condition. Refer to specific pediatric guidelines or institutional protocols.
* Commonly cited oral maintenance dose: 1-2 mEq/kg/day, not to exceed 40 mEq/day.
* IV administration requires extreme caution and close monitoring. Recommended rates are typically < 0.3-0.5 mEq/kg/hour, with a maximum concentration of 40 mEq/L.
## Dose Adjustments
* **Renal Impairment:** Dose reduction is necessary. Monitor serum potassium closely. Patients with severe renal impairment may not tolerate potassium supplementation.
## Contraindications
* Hyperkalemia (serum potassium > 5.0 mEq/L).
* Conditions that predispose to hyperkalemia (e.g., untreated Addison's disease, certain renal disorders).
* Known hypersensitivity to potassium chloride.
* Intestinal obstruction or atony.
## Adverse Effects
* **Common:** Nausea, vomiting, diarrhea, abdominal discomfort.
* **Serious:** Hyperkalemia (manifesting as muscle weakness, fatigue, paresthesias, cardiac arrhythmias, cardiac arrest), gastrointestinal bleeding, ulceration, or perforation (especially with oral solid dosage forms).
## Key Drug Interactions
* **Potassium-sparing diuretics** (e.g., spironolactone, amiloride, triamterene) and **ACE inhibitors, ARBs, NSAIDs, trimethoprim:** Increased risk of hyperkalemia.
* **Salt substitutes:** Contain potassium chloride and can lead to significant potassium intake.
* **Certain medications affecting GI motility:** May alter absorption.
## Monitoring
* Serum potassium levels (frequency dependent on route of administration, dose, and clinical status).
* Renal function (serum creatinine, BUN).
* Electrocardiogram (ECG) for signs of hyperkalemia, especially with IV administration or in patients at risk.
* Signs and symptoms of hypokalemia (e.g., muscle cramps, weakness, fatigue, arrhythmias) and hyperkalemia.
## Clinical Pearls
* Oral potassium chloride should be taken with meals or a snack and a full glass of water to minimize gastrointestinal upset and irritation.
* Dilute liquid preparations and IV infusions as recommended to reduce GI or vascular irritation.
* IV potassium is a vesicant and should be administered slowly and with caution. Central venous access is preferred for higher concentrations or rates.
* Rapid IV infusion of potassium can be fatal.
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*Disclaimer: This information is intended for clinical decision-making and does not replace comprehensive drug information resources. Always consult the most current prescribing information and institutional protocols before administering any medication.*
