glucose monohydrate + potassium chloride: clinical use

Prescribing considerations

• Confirm adequate renal function and urine flow before administration.
• Consider diabetes or impaired glucose tolerance, cardiac disease, oedematous states, pulmonary oedema, existing hyponatraemia and conditions associated with hyperkalaemia.
• Correct pre-existing thiamine deficiency before administering a glucose-containing infusion.
• Account for concurrent medicines affecting potassium or vasopressin activity.
• Use ready-prepared potassium infusions where appropriate to reduce preparation errors.

Contraindications and cautions

• Hyperkalaemia.
• Severe renal impairment with oliguria or anuria.
• Severe hyperchloraemia.
• Hyperhydration.
• Hyperglycaemia.
• The first 24 hours after head trauma.

Monitoring

• Serum potassium, sodium and other relevant electrolytes.
• Renal function and urine output.
• Blood glucose.
• Fluid balance and signs of overload.
• ECG according to clinical risk and potassium replacement circumstances.
• Infusion site for pain, inflammation, phlebitis or extravasation.

Clinical pharmacology

Intravenous administration provides complete systemic availability. Potassium is transported mainly into cells; potassium and chloride are principally eliminated by the kidneys. Glucose is metabolised for energy, with excess stored as glycogen or converted to fat.

Formulation and product differences

• The selected product is a clear aqueous solution containing potassium chloride and glucose monohydrate, with water for injections as the excipient.
• It contains no sodium and can become physiologically hypotonic after glucose metabolism, creating a clinically important hyponatraemia risk.
• The containers are single-use; remaining solution must be discarded.
• In the absence of compatibility studies, it should not be mixed with other medicines.
• Glucose-containing solutions should not be administered through the same equipment immediately before, during or after blood administration because of pseudoagglutination risk.