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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 of hypokalemia.
* Prevention of hypokalemia in patients at risk.
## Adult Dosing
* **Oral:**
* Treatment: 20-100 mEq per day, divided into 2-5 doses. Maximum daily dose typically 200 mEq.
* Prevention: 20-40 mEq per day.
* **Intravenous (IV):**
* Treatment (mild hypokalemia, serum K+ 3.0-3.5 mEq/L): 20-40 mEq added to 1 L of IV fluid, infused at a rate not exceeding 10-20 mEq/hour.
* Treatment (severe hypokalemia, serum K+ <2.5 mEq/L): 40 mEq added to 1 L of IV fluid, infused at a rate not exceeding 20-40 mEq/hour. Maximum rate for rapid infusion is 40 mEq/hour, and continuous cardiac monitoring is recommended.
* Prevention: 10-20 mEq per day.
*Note: Specific IV dosing and infusion rates may depend on local protocol and patient's clinical status.*
## Pediatric Dosing
* **Oral:**
* Treatment: 2-5 mEq/kg/day, divided into 2-4 doses. Maximum daily dose typically 200 mEq.
* Prevention: 1-2 mEq/kg/day.
* **Intravenous (IV):**
* Treatment: 0.3-1 mEq/kg/dose or 20-40 mEq/L of IV fluid. Maximum infusion rate typically 10-20 mEq/hour, but higher rates (up to 40 mEq/hour) may be used in emergencies with continuous cardiac monitoring.
* Maximum concentration for peripheral IV administration is generally 40 mEq/L. For central venous administration, concentrations up to 100 mEq/L may be used.
*Note: Pediatric IV dosing and infusion rates require careful titration based on serum potassium levels and clinical assessment, and often rely on institutional guidelines.*
## Dose Adjustments
* Dose should be adjusted based on serum potassium levels, ECG findings, and clinical response.
* Reduce dose in patients with renal impairment.
## Contraindications
* Hyperkalemia.
* Conditions causing generalized cellular swelling such as anuria, severe continuing oliguria, and inadequate tissue perfusion.
* Untreated adrenal insufficiency.
* Certain neuromuscular diseases.
## Adverse Effects
* **Common:** Nausea, vomiting, diarrhea, abdominal pain.
* **Serious:** Hyperkalemia (especially with rapid IV infusion or in renal impairment), cardiac arrhythmias, ECG changes, cardiac arrest, gastrointestinal ulceration, bleeding, or perforation (especially with sustained-release oral formulations).
## Key Drug Interactions
* **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia.
* **ACE inhibitors, Angiotensin II Receptor Blockers (ARBs), NSAIDs:** Can increase serum potassium by reducing potassium excretion.
* **Digoxin:** Hyperkalemia can increase digoxin toxicity; hypokalemia can increase digoxin toxicity.
* **Other drugs that cause hyperkalemia:** Increased risk of severe hyperkalemia.
## Monitoring
* Serum potassium levels (frequently during IV therapy and after dose changes).
* Renal function (BUN, creatinine).
* ECG monitoring, especially during IV administration and in patients with suspected cardiac abnormalities or severe hypokalemia.
* Monitor for signs and symptoms of hyperkalemia (muscle weakness, paresthesias, arrhythmias, bradycardia).
* Monitor for GI side effects with oral formulations.
## Clinical Pearls
* Oral potassium supplements should be taken with meals or a full glass of water to minimize gastrointestinal irritation.
* IV potassium chloride must be diluted and infused slowly. Never administer as an IV bolus.
* Rapid IV infusion of potassium chloride can be fatal.
* Consider the source of potassium loss (e.g., diuretics, vomiting, diarrhea) when determining treatment strategy.
* Patients with impaired renal function require particularly cautious dosing and close monitoring due to increased risk of hyperkalemia.
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*Disclaimer: This information is intended for healthcare professionals. Always verify current prescribing information and consult with a pharmacist or physician for specific patient care decisions.*
