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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.
* Maintenance of potassium levels during diuretic therapy or in states of potassium loss.
## Adult Dosing
* **Oral:**
* **Prevention:** 20 mEq (1.5 g) daily, divided into 1-2 doses.
* **Treatment:** 40-100 mEq (3-7.5 g) daily, divided into 2-4 doses. Maximum daily dose generally does not exceed 200 mEq (15 g).
* Maximum single dose: 20 mEq (1.5 g) for immediate-release formulations. Extended-release formulations may have higher single doses per product labeling.
* **Intravenous (IV):**
* **Hypokalemia (serum K < 3.0 mEq/L):** 10-20 mEq (0.75-1.5 g) per hour. Dosing depends on severity. Maximum infusion rate is typically 10 mEq/hour (0.75 g/hr) in peripheral lines and up to 20 mEq/hour (1.5 g/hr) in central lines, but local protocol should be followed.
* **Maintenance:** 20-40 mEq (1.5-3 g) per 24 hours.
* **Maximum daily dose:** Typically 200 mEq (15 g) per 24 hours, but may be higher in severe, refractory hypokalemia under close cardiac monitoring.
* **Concentration:** Peripheral IV infusions should not exceed 40 mEq/L (3 g/L). Central IV infusions can be higher (up to 80 mEq/L or 6 g/L) but require careful administration.
## Pediatric Dosing
Dosing is weight-based and depends on the severity of hypokalemia and clinical indication. Consult pediatric guidelines or pharmacy for specific recommendations. Generally:
* **Oral:** 1-2 mEq/kg/day (0.075-0.15 g/kg/day) divided into 1-2 doses, not to exceed adult maximums.
* **IV:** 0.5-1 mEq/kg/dose (0.0375-0.075 g/kg/dose) infused over 1-3 hours. Maximum infusion rate generally 0.5-1 mEq/kg/hr (0.0375-0.075 g/kg/hr).
## Dose Adjustments
* **Renal Impairment:** Dose reduction is necessary. Monitor potassium levels closely.
* **Adrenal Insufficiency:** Increased sensitivity to potassium.
## Contraindications
* Hyperkalemia.
* Conditions where potassium may accumulate to toxic levels (e.g., severe renal impairment, untreated Addison's disease, acute dehydration, extensive tissue injury).
## Adverse Effects
* **Gastrointestinal (Oral):** Nausea, vomiting, abdominal pain, diarrhea, gastrointestinal bleeding or perforation (especially with rapid release tablets or in patients with delayed gastric emptying).
* **Cardiovascular (IV):** Cardiac arrhythmias, cardiac arrest (especially with rapid infusion or hyperkalemia).
* **General:** Hyperkalemia (potentially life-threatening), phlebitis (IV).
## Key Drug Interactions
* **Potassium-sparing diuretics (e.g., spironolactone, amiloride, triamterene):** Increased risk of hyperkalemia.
* **ACE inhibitors and ARBs:** Can cause potassium retention and increase the risk of hyperkalemia.
* **NSAIDs:** Can reduce the renal excretion of potassium, increasing hyperkalemia risk.
* **Digoxin:** Hyperkalemia can increase digoxin toxicity. Hypokalemia increases the risk of digoxin toxicity.
## Monitoring
* Serum electrolytes (especially potassium) frequently, particularly during IV administration and dose adjustments.
* Renal function (BUN, creatinine).
* ECG monitoring for signs of hyperkalemia (especially with IV infusions or high doses).
## Clinical Pearls
* Oral potassium chloride should be taken with food or meals to minimize gastrointestinal upset.
* Dilute IV potassium chloride appropriately before administration. Never administer as an IV push injection.
* Rapid IV infusion of potassium can be fatal. Adhere strictly to recommended infusion rates.
* Monitor patients closely for signs and symptoms of hyperkalemia: muscle weakness, paresthesias, confusion, hypotension, arrhythmias.
* Patient education is crucial regarding oral formulation administration and recognizing adverse effects.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information for the specific product being used and consider individual patient factors. Local protocols may dictate specific dosing and administration guidelines.*
