📋 Clinical Overview

Potassium Chloride (15% w/v) is a concentrated intravenous electrolyte replenishment solution. It provides 2 mEq of potassium per mL (equivalent to 150 mg KCl per mL). It is a critical medication for the correction of severe hypokalemia and is NEVER administered undiluted or via IV push. It must be diluted in a suitable large-volume parenteral fluid before administration to prevent life-threatening cardiac arrhythmias and phlebitis.

💊 Dosage & Administration

Adult: Dose is individualized based on serum potassium level and clinical status. General guideline: 20-40 mEq (10-20 mL of 15% solution) diluted in 500-1000 mL of IV fluid (e.g., 0.9% NaCl, 5% Dextrose) over 2-4 hours. Maximum concentration in peripheral line: 40 mEq/L. Maximum concentration in central line: 60-80 mEq/L (under strict monitoring).

Note: 1. NEVER inject undiluted or as IV bolus. 2. Always dilute in a large-volume parenteral solution. 3. Use an infusion pump for precise rate control. 4. For peripheral infusion, concentration should not exceed 40 mEq/L to avoid phlebitis. 5. Invert bag gently to mix. Do not add to hanging IV bag via syringe. 6. Monitor ECG and serum potassium frequently during infusion. 7. Assess IV site for pain, erythema (signs of infiltration).

⚠️ Contraindications

Hyperkalemia (serum K+ > 5.0 mEq/L)
Severe renal impairment (e.g., anuria, oliguria, acute renal failure) unless closely monitored
Untreated Addison's disease
Concurrent use of potassium-sparing diuretics (e.g., spironolactone, amiloride) in most cases
Known hypersensitivity to any component

🔬 Mechanism of Action

Potassium is the principal intracellular cation (140-150 mEq/L). It is essential for maintaining intracellular tonicity, nerve impulse conduction, cardiac and skeletal muscle contractility, and acid-base balance. Administration of potassium chloride directly increases serum potassium levels, correcting the ionic gradient across cell membranes.

🤕 Side Effects

Pain, phlebitis, or burning at injection site (if concentration is high)
Nausea, vomiting (if serum levels rise too rapidly)
Diarrhea (not relevant for IV route)
Hyperkalemia (if infused too rapidly or in renal impairment)

🤰 Special Populations

Pregnancy: Category C (US FDA). Potassium crosses the placenta. Use only if clearly needed, such as for treatment of severe maternal hypokalemia. Maternal hypokalemia itself is harmful to fetus.

Driving: No direct effect. However, underlying condition (e.g., muscle weakness from hypokalemia) or over-correction (hyperkalemia causing weakness) may impair ability.

🔄 Drug Interactions

ACE Inhibitors (e.g., Ramipril, Enalapril)	Increased risk of hyperkalemia due to reduced aldosterone.	Major
Angiotensin II Receptor Blockers (ARBs e.g., Losartan)	Increased risk of hyperkalemia due to reduced aldosterone.	Major
Potassium-Sparing Diuretics (e.g., Spironolactone, Amiloride)	Additive hyperkalemic effect.	Major
NSAIDs (e.g., Ibuprofen, Diclofenac)	May reduce renal potassium excretion, increasing risk.	Moderate
Heparin	Can inhibit aldosterone, increasing risk of hyperkalemia.	Moderate
Digoxin	Hypokalemia potentiates digoxin toxicity. Correction of K+ can alter digoxin effect. Monitor closely.	Major
Beta-2 Agonists (e.g., Salbutamol)	Can cause intracellular shift of potassium, lowering serum levels transiently.	Moderate
Insulin	Promotes intracellular shift of potassium. Essential in DKA management but can mask true serum levels.	Moderate

🔁 Alternatives to Potchlor 15%

Same composition (Potassium Chloride (15% w/v)), different brands:

KCL 15% (Generic) Zukamin-K K-Exit 15% GKL 15%