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# Potassium Chloride ## Overview Potassium chloride (KCL) is an essential electrolyte used to treat and prevent hypokalemia. It is available in various formulations including oral tablets, capsules, liquids, and intravenous solutions. ## Primary Indications * Treatment and prevention of hypokalemia. * Potassium supplementation in patients receiving diuretics that deplete potassium. ## Adult Dosing * **Oral:** * **Prevention:** 20 mEq (1.5 g) per day. * **Treatment:** 40-100 mEq (3-7.5 g) per day, divided into 2-5 doses. Maximum daily dose typically 200 mEq (15 g), but often limited to 100-120 mEq (7.5-9 g) depending on severity and patient tolerance. * **Intravenous (IV):** * **Mild Hypokalemia (serum K+ 3.0-3.5 mEq/L):** 10-20 mEq (0.75-1.5 g) added to 1 L of IV fluid, infused over 1-2 hours. * **Moderate Hypokalemia (serum K+ 2.5-3.0 mEq/L):** 20-40 mEq (1.5-3 g) added to 1 L of IV fluid, infused over 2-4 hours. * **Severe Hypokalemia (serum K+ < 2.5 mEq/L):** Requires aggressive treatment, often via central venous access. Doses can be higher, up to 40 mEq (3 g) per hour, but this should be done with continuous cardiac monitoring and in an intensive care setting. **Specific IV infusion rates and concentrations are highly dependent on local hospital protocols and the patient's clinical status.** Maximum recommended IV dose is often 200 mEq (15 g) in 24 hours. ## Pediatric Dosing * **Oral:** 1-2 mEq/kg/day divided into 1-2 doses, not to exceed adult maximums. * **Intravenous (IV):** Typical maintenance: 20-40 mEq/L (1.5-3 g/L) of IV fluid. For correction of hypokalemia, doses vary widely based on severity and age. **Use with caution and close monitoring.** A common guideline for severe hypokalemia is 0.3-0.5 mEq/kg/hour, not to exceed 1 mEq/kg/hour, administered via central line. **Specific pediatric IV dosing is highly variable and should follow institutional guidelines and expert consultation.** ## Dose Adjustments * **Renal Impairment:** Dose reduction is necessary. Monitor potassium levels closely. Contraindicated in severe renal impairment. * **Adrenal Insufficiency:** Patients may be more sensitive to potassium. ## Contraindications * Hyperkalemia. * Conditions causing impaired potassium excretion (e.g., severe renal impairment, Addison's disease, anuria, severe trauma, extensive tissue damage). * Certain medications that increase serum potassium (e.g., potassium-sparing diuretics, ACE inhibitors, ARBs, NSAIDs, heparin). ## Adverse Effects * **Common:** Nausea, vomiting, diarrhea, abdominal pain, flatulence. * **Serious:** Hyperkalemia (muscle weakness, paralysis, cardiac arrhythmias, cardiac arrest), esophageal or gastric irritation/perforation (especially with oral formulations), phlebitis (IV). ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride), ACE inhibitors (e.g., lisinopril), Angiotensin II Receptor Blockers (ARBs) (e.g., losartan), NSAIDs, Heparin:** Increase the risk of hyperkalemia. * **Succinylcholine:** May potentiate hyperkalemic effects. * **Corticosteroids:** May increase potassium loss. ## Monitoring * Serum electrolytes (especially potassium and sodium) frequently, particularly during IV therapy or dose changes. * Renal function (BUN, creatinine). * ECG for signs of hyperkalemia (peaked T waves, widened QRS complex), especially during rapid IV infusions. * Signs and symptoms of hypokalemia (muscle weakness, fatigue, constipation, arrhythmias) and hyperkalemia (nausea, diarrhea, muscle weakness, paresthesias). ## Clinical Pearls * Oral potassium chloride tablets and capsules should be taken with meals or a full glass of fluid to minimize gastrointestinal upset and reduce the risk of esophageal irritation. * Dilute concentrated liquid potassium chloride thoroughly before administration. * IV potassium chloride must be administered slowly and carefully. Never administer as an IV push or bolus. **Maximum infusion rates and concentrations are critical to prevent cardiac events.** * Correct magnesium levels if low, as hypomagnesemia can impair potassium repletion. * Always verify the concentration and infusion rate of IV potassium solutions before administration. *** **Disclaimer:** This information is intended for clinical use and does not replace a thorough review of the most current prescribing information and institutional protocols. Always consult official drug monographs and clinical guidelines for comprehensive and up-to-date information.