Potassium Chloride
Potassium chloride is an electrolyte supplement used to replace potassium deficits and support potassium balance. Veterinary applications include acute or ongoing hypokalemia caused by losses, inadequate intake or redistribution. Oral and diluted parenteral preparations have different clinical roles. The chloride component can also contribute to replacement when chloride depletion accompanies the potassium deficit.
Group
Potassium supplement
Mechanism of Action
Potassium chloride dissociates to supply potassium and chloride ions. Restoring extracellular and intracellular potassium availability supports resting membrane potentials, skeletal and smooth-muscle function, cardiac electrical activity and cellular enzyme systems. Replacement corrects the functional consequences of potassium deficiency. Chloride contributes to extracellular electrolyte and acid–base balance, particularly when the deficit includes chloride loss.
Dose Rates
Dogs
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Potassium supplementation | Reference only | IV | Reported regimen describes 0.5 mEq potassium/kg/day or 10-40 mEq per 500 mL IV fluid, individualized to serum potassium and total fluid delivery. | |
| Acute hypokalemia | 0.5 mEq/kg/hour | IV | Continuous | Upper reported rate; individualize downward as needed. Never exceed 0.5 mEq/kg/hour and never give concentrate as a bolus. |
| Mild chronic hypokalemia | 0.5–1 mEq/kg | PO | Every 12–24 h | Oral potassium amount; individualize formulation and serum monitoring. |
| Maintenance potassium infusion | 0.05–0.1 mEq/kg/hour | IV | Continuous | Diluted potassium chloride; titrate from serial measurements. |
Cats
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Potassium supplementation | Reference only | IV | Reported regimen describes 0.5 mEq potassium/kg/day or 10-40 mEq per 500 mL IV fluid, individualized to serum potassium and total fluid delivery. | |
| Acute hypokalemia | 0.5 mEq/kg/hour | IV | Continuous | Upper reported rate; individualize downward as needed. Never exceed 0.5 mEq/kg/hour and never give concentrate as a bolus. |
| Mild chronic hypokalemia | 0.5–1 mEq/kg | PO | Every 12–24 h | Oral potassium amount; individualize formulation and serum monitoring. |
| Maintenance potassium infusion | 0.05–0.1 mEq/kg/hour | IV | Continuous | Diluted potassium chloride; titrate from serial measurements. |
Cattle
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Potassium supplementation | Reference only | IV | Add 20-40 mEq potassium per liter IV fluid. Total fluid rate must keep potassium delivery at or below 0.5 mEq/kg/hour. | |
| Oral potassium supplementation | 100 g/animal | PO | Every 24 h | 100 g potassium chloride provides approximately 52 g elemental potassium. |
| Oral potassium replacement | 50 g/animal | PO | Every 24 h |
Horses
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Potassium supplementation | Reference only | IV | Add 20-40 mEq potassium per liter IV fluid. Total fluid rate must keep potassium delivery at or below 0.5 mEq/kg/hour. |
Indications
- Treatment of hypokalemia in veterinary patients, including deficits associated with gastrointestinal losses, diuretic therapy or reduced intake.
- Prevention of ongoing potassium depletion during selected fluid, diabetic or other critical-care treatment plans.
- Oral replacement of mild or chronic potassium deficits in patients suitable for enteral supplementation.
- Replacement of potassium depletion in anorexic or ill cattle and other livestock when a deficit is present.
Contraindications
- Renal impairment requires caution; avoid supplementation when potassium is excessive.
- Avoid chloride supplementation with hyperchloremic metabolic acidosis.
Interactions
- Other potassium sources, ACE inhibitors and potassium-sparing diuretics can increase hyperkalemia; account for digoxin and diuretic therapy.
Adverse effects
- Gastrointestinal irritation; hyperkalemia causes weakness, bradycardia, arrhythmias and arrest.
Toxicity
Excessive potassium can cause fatal cardiovascular toxicity. Rapid potassium delivery or impaired renal excretion can cause fatal hyperkalemia. Stop supplementation and monitor ECG, potassium and acid-base status; treatment may require membrane stabilization and intracellular potassium shifting.
Preparations
| Preparation | Form | Strength | Route |
|---|---|---|---|
| Potassium chloride concentrate 2 mEq/mL Potassium equivalent; must be diluted and thoroughly mixed before infusion. | Injection | 2 mEq / mL | IV |
Monitoring and Administration
Adjust from serial potassium concentrations and renal function; use ECG monitoring when indicated.
Dilute IV concentrate, mix thoroughly and never administer as a bolus. Maximum rate is 0.5 mEq/kg/hour.
Guidance for supplemented IV fluids: potassium below 2 mEq/L, 60 mEq/L fluid; 2-2.5, 40 mEq/L; 2.5-3, 30 mEq/L; 3-3.5, 20 mEq/L. These are concentrations, not delivery rates. Check magnesium in refractory hypokalemia. A separate line says 0.5 mEq/hour without /kg and appears internally inconsistent; it is not substituted for the weight-based limit.
A critical-care alternative reports up to 1.5 mEq/kg/hour at potassium below 2 mEq/L with uninterrupted ECG, but this conflicts with the other supplied maximum 0.5 mEq/kg/hour. High-rate rescue requires a dedicated validated protocol and is not part of the generic calculator. More than 10 mEq/hour in an animal under 10 kg can be life-threatening.
Bovine combined oral fluid example: 80 g sodium chloride plus 20 g potassium chloride in 10 L water by stomach tube, with access to comparable solution and fresh water. Severe-recumbency report uses KCl 11.5 g/L at 4 mL/kg/hour and up to 200 g/day orally; another reports 1 mEq/kg/hour IV. These intensive combined protocols conflict with the generic infusion ceiling and need protocol support.