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# Potassium Chloride
## Overview
Potassium chloride (KCL) is an essential electrolyte used to treat or prevent hypokalemia. It is available in oral and intravenous formulations.
## Primary Indications
* Treatment and prevention of hypokalemia.
* Adjunctive treatment of digitalis toxicity.
## Adult Dosing
* **Oral:**
* Prevention: 20 mEq (1.5 g) once to twice daily.
* Treatment: 40-100 mEq (3-7.5 g) daily, divided into 2-5 doses. Maximum usually 20 mEq per dose.
* Concentrated oral solutions (e.g., 20% KCL, 40 mEq/15 mL) must be diluted in at least 4 oz (120 mL) of liquid before administration.
* **Intravenous (IV):**
* **Mild Hypokalemia (serum K+ 2.5-3.5 mEq/L):** Up to 20 mEq per dose, infused over 2-6 hours. Maximum total daily dose typically 200 mEq.
* **Severe Hypokalemia (serum K+ < 2.5 mEq/L):** May require higher doses, but infusion rates and concentrations must be carefully managed. Often administered via central venous access.
* **Maximum infusion rate:** Typically 10 mEq/hour peripherally, and up to 20 mEq/hour centrally, but can be faster in emergencies under close cardiac monitoring. **Never administer IV push.**
* **Maximum concentration:** Typically 40 mEq/L peripherally to reduce phlebitis. Higher concentrations (up to 80 mEq/L or more) may be used centrally in severe cases.
## Pediatric Dosing
* **Oral:**
* Recommended daily intake varies by age. For treatment of hypokalemia, doses are often 1-2 mEq/kg/day, divided into 2-4 doses, not to exceed 3 mEq/kg/day or 40 mEq/day.
* **Intravenous (IV):**
* Dosing is highly individualized based on potassium levels and clinical status. Typical maintenance: 20-30 mEq/L of intravenous fluids.
* For replacement, doses can range from 0.5-1 mEq/kg per dose, infused slowly. Maximum infusion rate is generally 0.3-0.5 mEq/kg/hour (or 10-20 mEq/hour), but higher rates may be used in emergencies with continuous ECG monitoring. Maximum concentration typically 40 mEq/L.
## Dose Adjustments
* **Renal Impairment:** Use with extreme caution. Reduce dose significantly, monitor potassium closely.
* **Adrenal Insufficiency:** May require lower doses.
## Contraindications
* Hyperkalemia.
* Conditions where potassium is not effectively excreted (e.g., severe renal impairment, untreated Addison's disease, anuria, severe burn trauma).
* Gastrointestinal obstruction or delayed gastric emptying.
## Adverse Effects
* **Common:** Nausea, vomiting, diarrhea, abdominal pain.
* **Serious:**
* **Hyperkalemia:** Palpitations, muscle weakness, confusion, paralysis, cardiac arrhythmias, cardiac arrest.
* **IV:** Phlebitis, venous irritation, pain at injection site.
## Key Drug Interactions
* **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene), ACE inhibitors, ARBs, NSAIDs, cyclosporine, tacrolimus:** Increased risk of hyperkalemia.
* **Digitalis glycosides:** Potassium levels affect digitalis toxicity. Hypokalemia increases the risk of toxicity.
## Monitoring
* Serum potassium levels (frequently, especially during IV administration or dose changes).
* Renal function (BUN, creatinine).
* ECG (especially for rapid IV infusion or signs of hyperkalemia).
* Signs and symptoms of hypokalemia (weakness, fatigue, cramps) and hyperkalemia (arrhythmias, muscle weakness).
## Clinical Pearls
* Oral liquid formulations should always be diluted.
* IV potassium is a vesicant and must be administered slowly and with caution to avoid cardiac and vascular complications. Central venous access is preferred for higher concentrations or rates.
* Monitor electrolytes closely in patients receiving diuretics, laxatives, or those with vomiting/diarrhea.
* Rapid correction of hypokalemia can be dangerous.
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**Disclaimer:** This information is intended for healthcare professionals and does not replace the need to consult the official prescribing information and relevant clinical guidelines for the most up-to-date and comprehensive details. Always verify current drug information before prescribing or dispensing.
