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# Potassium Chloride
## Overview
Potassium chloride (KCl) is an electrolyte supplement used to prevent or treat 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) daily.
* Treatment: 40-100 mEq (3-7.5 g) daily, divided into 2-5 doses. Maximum oral dose is typically 200 mEq (15 g) daily, but higher doses may be used under close medical supervision.
* **Intravenous (IV):**
* Treatment: Typically 10-40 mEq (0.75-3 g) per dose, added to a compatible IV fluid. Maximum infusion rate generally **should not exceed 10 mEq/hour** unless in a critical care setting with continuous ECG monitoring and frequent serum potassium checks. Higher rates (up to 40 mEq/hour) may be used in life-threatening hypokalemia with appropriate monitoring. Total daily dose should not exceed 200 mEq (15 g).
## Pediatric Dosing
* **Oral:** 1-2 mEq/kg/day, divided into 1-4 doses. Maximum dose typically 3 mEq/kg/day or 200 mEq/day.
* **Intravenous (IV):** 0.5-1 mEq/kg per dose, added to IV fluid. Maximum concentration **should not exceed 40 mEq/L (or 20 mEq/L in neonates)**, infused at a rate not exceeding 10 mEq/hour, unless in a critical care setting with continuous ECG monitoring and frequent serum potassium checks.
## Dose Adjustments
* **Renal Impairment:** Use with extreme caution. Reduced doses or avoidance may be necessary due to risk of hyperkalemia.
## Contraindications
* Severe renal impairment.
* Conditions associated with hyperkalemia (e.g., anuria, oliguria, severe untreated Addison's disease, hyperadrenocorticism, acute dehydration, granulocytopenia).
* Certain medications known to cause hyperkalemia (see Drug Interactions).
## Adverse Effects
* **Common:** Nausea, vomiting, abdominal pain, diarrhea.
* **Serious:** Hyperkalemia (manifesting as muscle weakness, paresthesias, cardiac arrhythmias, cardiac arrest), gastrointestinal ulceration, bleeding, perforation, obstruction.
## Key Drug Interactions
* **Potassium-sparing diuretics** (e.g., spironolactone, amiloride, triamterene), **ACE inhibitors**, **ARBs**, **NSAIDs**, **heparin**, **cyclosporine**, **tacrolimus**, **trimethoprim**: Increased risk of hyperkalemia.
* **Beta-blockers:** May increase serum potassium levels.
## Monitoring
* Serum potassium levels (especially with IV administration, rapid correction, or in patients with renal impairment).
* Renal function (BUN, creatinine).
* ECG (especially with IV administration or suspected hyperkalemia).
* Signs and symptoms of hypokalemia and hyperkalemia.
## Clinical Pearls
* Oral potassium chloride should be taken with meals or food to minimize gastrointestinal upset.
* Do not administer potassium chloride undiluted via IV infusion.
* Rapid IV infusion of concentrated potassium can be fatal.
* When correcting severe hypokalemia, caution is advised to avoid overshoot and hyperkalemia.
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**Disclaimer:** This information is intended for educational purposes only and does not substitute for professional medical advice. Always consult the most current prescribing information and product monographs for complete details and to verify dosages and safety information before administering any medication.
