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# Potassium Chloride
## Overview
Potassium chloride (KCl) is an electrolyte used to treat and prevent hypokalemia. It is available in oral and intravenous formulations.
## Primary Indications
* Treatment and prevention of hypokalemia.
* Adjunctive therapy in digitalis intoxication.
## Adult Dosing
* **Hypokalemia (mild):** Oral: 20 mEq (1.5 g) once daily or 40 mEq (3 g) divided every 12 hours.
* **Hypokalemia (severe):** Oral: Up to 40-100 mEq (3-7.5 g) per day, divided into 2-4 doses. Maximum oral dose typically 20 mEq (1.5 g) per dose.
* **Hypokalemia (intravenous):** IV infusion: Typically 10-20 mEq (0.75-1.5 g) per hour. Maximum rate of infusion generally 20-40 mEq/hour (1.5-3 g/hour), but may be higher in life-threatening situations under strict ECG monitoring. Maximum concentration typically 40 mEq/L (3 g/L), but up to 80 mEq/L (6 g/L) may be used cautiously in critical care with central venous access.
* **Maintenance:** Oral: 20 mEq (1.5 g) per day.
## Pediatric Dosing
* **Hypokalemia:** Oral: 2-4 mEq/kg/day (0.15-0.3 g/kg/day) divided into 2-4 doses. Maximum daily dose is typically 100 mEq (7.5 g).
* **Hypokalemia (intravenous):** IV infusion: 1 mEq/kg/dose (0.075 g/kg/dose) infused over 1-3 hours. Maximum infusion rate generally 0.5-1 mEq/kg/hour (0.0375-0.075 g/kg/hour), or up to 20 mEq/hour (1.5 g/hour) if severe, with ECG monitoring.
## Dose Adjustments
* **Renal Impairment:** Use with extreme caution. Dosing should be individualized based on serum potassium levels and renal function. Risk of hyperkalemia is significantly increased.
* **Adrenal Insufficiency:** Requires careful monitoring.
## Contraindications
* Severe renal impairment with oliguria, anuria, or azotemia.
* Untreated adrenal insufficiency.
* Uncorrected hyperkalemia.
* Conditions which may cause medication accumulation or increase the risk of gastrointestinal obstruction or perforation (e.g., delayed gastric emptying, esophageal compression, intestinal strictures, peptic ulceration).
* Potassium chloride injection is contraindicated for IV use in patients with hyperkalemia or anuria.
## Adverse Effects
* **Gastrointestinal:** Nausea, vomiting, diarrhea, abdominal pain, flatulence, gastrointestinal bleeding, ulceration, perforation, obstruction.
* **Cardiovascular:** Cardiac arrhythmias, cardiac arrest, hypotension (with rapid IV infusion).
* **Neuromuscular:** Paresthesia, confusion, muscle weakness, paralysis.
* **Other:** Hyperkalemia (potentially life-threatening), phlebitis (with IV infusion).
## Key Drug Interactions
* **ACE inhibitors, Angiotensin Receptor Blockers (ARBs), Aldosterone Antagonists, Potassium-Sparing Diuretics (e.g., spironolactone, amiloride, triamterene), NSAIDs, Heparin, Trimethoprim:** Increased risk of hyperkalemia.
* **Digitalis Glycosides:** Hypokalemia enhances digitalis toxicity. Potassium supplementation is used to treat digitalis-induced arrhythmias.
* **Neuromuscular Blocking Agents:** Potassium can affect neuromuscular transmission and may potentiate or antagonize the effects of these agents.
## Monitoring
* **Serum Potassium:** Monitor frequently, especially during IV administration and in patients with renal impairment.
* **Renal Function:** Monitor BUN and creatinine.
* **ECG:** Essential for IV administration, especially rapid infusions or high doses, to detect signs of hyperkalemia (e.g., peaked T waves, widened QRS).
* **Signs and Symptoms of Hypokalemia:** Muscle weakness, fatigue, constipation, arrhythmias.
* **Signs and Symptoms of Hyperkalemia:** Numbness, tingling, muscle weakness, fatigue, shortness of breath, chest pain, irregular heartbeat.
## Clinical Pearls
* Oral potassium chloride tablets/capsules can cause gastrointestinal irritation, ulceration, and bleeding. They should be taken with food or immediately after meals and with plenty of fluid.
* Liquid or powder formulations may be better tolerated and have a lower risk of GI complications.
* Intravenous potassium administration is a high-alert medication. It must be administered slowly and diluted properly to avoid cardiac arrest. Never administer as an IV push.
* For severe hypokalemia or hypokalemia with ECG changes, rapid IV infusion may be necessary, but this requires close cardiac monitoring in an intensive care setting.
* In patients with digitalis toxicity and hypokalemia, potassium is indicated, but caution is advised if the patient has significant renal impairment.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols before administering any medication.*
