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# Potassium Chloride
## Overview
Potassium chloride (KCl) is an essential electrolyte used to correct or prevent hypokalemia. It is available in oral and intravenous formulations.
## Primary Indications
* Treatment and prevention of hypokalemia.
## Adult Dosing
* **Oral:**
* Prevention: 20 mEq (1.5 g KCl) daily in 1-2 divided doses.
* Treatment: 40-100 mEq (3-7.5 g KCl) daily in 2-4 divided doses. Maximum recommended daily dose is 200 mEq.
* **Intravenous (IV):**
* Treatment of severe hypokalemia or when oral administration is not feasible. Dosing depends on serum potassium level, severity of hypokalemia, and patient's clinical status.
* Generally administered as a continuous infusion. **Concentration should not exceed 40 mEq/L in peripheral IV lines and 80 mEq/L in central IV lines** to reduce phlebitis risk.
* Infusion rates should generally **not exceed 10-20 mEq/hour** in adults to avoid cardiac arrhythmias, unless severe life-threatening hypokalemia is present and managed in a critical care setting with continuous ECG monitoring. Specific rates in critical situations may be guided by local protocol.
* Total daily IV dose typically ranges from 100-200 mEq, but may be higher in severe cases.
## Pediatric Dosing
* **Oral:**
* Prevention: 1-2 mEq/kg/day divided into 2-4 doses. Maximum 3 mEq/kg/day.
* Treatment: 2-5 mEq/kg/day divided into 2-4 doses. Maximum 20 mEq/day.
* **Intravenous (IV):**
* Dosing is highly individualized based on serum potassium, clinical status, and rate of correction desired.
* Maximum infusion rate: Generally **0.5-1 mEq/kg/hour (up to 20 mEq/hour)**. Higher rates may be used in emergencies with continuous ECG monitoring.
* Maximum concentration: **40 mEq/L** for peripheral infusions.
* Specific protocols for pediatric IV potassium administration are essential and often dictated by institutional guidelines.
## Dose Adjustments
* Renal impairment: Use with caution; potassium elimination is reduced. Monitor serum potassium closely.
* Adrenal insufficiency: Increased risk of hyperkalemia.
## Contraindications
* Hyperkalemia.
* Conditions causing the entry of potassium into cells, such as severe tissue trauma, burns, or extensive surgery.
* Conditions causing decreased renal excretion of potassium, such as chronic renal failure, untreated Addison's disease, or during treatment with potassium-sparing diuretics.
## Adverse Effects
* **Common:** Nausea, vomiting, diarrhea, abdominal pain.
* **Serious:** Hyperkalemia (symptoms include muscle weakness, fatigue, paresthesias, cardiac arrhythmias, cardiac arrest), esophageal or gastric irritation/perforation (with oral solid dosage forms).
## Key Drug Interactions
* **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene), ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), NSAIDs, cyclosporine, tacrolimus, heparin:** Increased risk of hyperkalemia.
* **Potassium-containing salt substitutes:** Increased risk of hyperkalemia.
* **Sodium polystyrene sulfonate:** May reduce absorption of oral potassium chloride.
* **Digitalis glycosides:** Hyperkalemia may increase toxicity; hypokalemia may increase toxicity.
## Monitoring
* Serum potassium levels (frequently, especially with IV administration or dose changes).
* Renal function (BUN, creatinine).
* ECG (especially with rapid IV infusion or suspected hyperkalemia).
* Signs and symptoms of hypokalemia and hyperkalemia.
## Clinical Pearls
* Oral potassium chloride tablets/capsules should be taken with meals or immediately after eating to minimize gastric irritation.
* Liquid formulations are generally preferred for ease of administration and reduced risk of esophageal injury.
* Dilute IV potassium chloride appropriately before administration to prevent phlebitis and ensure safe infusion rates.
* Rapid IV administration can be fatal. Always confirm prescribed concentration and infusion rate.
* Hypokalemia can be exacerbated by diuretics, vomiting, diarrhea, and inadequate dietary intake.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and institutional protocols before administering any medication.*
