Calcium Chloride vs Calcium Gluconate in Hyperkalemia: Dosing & Safety
By John Joseph Pack MD
Published on 05/10/2026
Calcium Chloride vs. Calcium Gluconate: Comparison Summary
Clinical Parameter | Calcium Chloride | Calcium Gluconate |
|---|---|---|
Mechanism of Action | Raises threshold potential; stabilizes cardiac myocytes | Raises threshold potential; stabilizes cardiac myocytes |
Elemental Calcium Potency | 3x higher (more potent, rapid onset) | 1/3 potency (slower acting) |
Preferred IV Route | Central line preferred | Peripheral IV safe |
Extravasation Risk | High: severe tissue necrosis | Low: non-caustic to superficial tissue |
Common Clinical Setting | Cardiac arrest / Code situations | Emergency Room / Bedside first-line |
Effect on Serum Potassium | Does NOT lower potassium | Does NOT lower potassium |
Mechanism of Action: Cardiac Membrane Stabilization
Calcium Chloride and Calcium Gluconate both stabilize cardiac myocyte membranes by raising the threshold potential, which becomes unstable in the setting of hyperkalemia.
Potency, Administration Route & Extravasation Risk
Calcium Chloride has three times the elemental Calcium compared to Calcium Gluconate, thus is more potent, and works quicker. Calcium Chloride is also more caustic and can cause tissue necrosis if it extravasates, thus central line administration is preferred. Calcium Gluconate is slower acting, not as potent, and is not as caustic to the tissues, allowing safer use through a peripheral IV, which makes it more commonly used in the ER.
Effect on Serum Potassium Levels
Neither lowers the Potassium level. Both work by stabilizing and raising the firing threshold of cardiac myocytes, thus reducing arrhythmia risk and cardiac excitability.
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