Potassium chloride — FY prescribing 💊 ✅

Potassium chloride — FY prescribing 💊

🚨 HIGH ALERT — EDUCATIONAL DRAFT, NOT A PRESCRIBING ORDER. Drug choice, indication, formulation, dose, route and monitoring require current BNF/BNFC, product SmPC and local NHS protocol. Source reviewed 3 November 2026; independent clinical/pharmacy sign-off pending.

🧬 Mechanism and reason for use

• Potassium chloride replaces potassium required for neuromuscular function and membrane potential.
• Oral replacement preferred where safe; IV correction only when clinically indicated with adequate monitoring.

💊 Indication-specific UK regimen / dosing boundary

• No universal IV potassium concentration or rate supplied. Use a locally approved ready-mixed infusion, pump and route-specific protocol.
• NEVER give concentrated potassium chloride as an IV push or add concentrated KCl to a fluid bag at ward level. NHS England maintains strict controls on storage of concentrated potassium.

🔎 Before writing a prescription

• Repeat sample if unexpected, check ECG if severe, renal function, urine output, magnesium and other potassium-containing medicines; review oral alternatives.
• Confirm mmol (not mg) and the total mmol AND mmol/hour; check prescribed concentration, peripheral/central access and infusion pump.

🧪 Monitoring and reassessment

• Serum K, Mg, creatinine and ECG according to severity, replacement rate and local protocol.

🚨 Serious pitfalls / when to escalate

• Rapid IV potassium can cause fatal arrhythmia. Never use potassium-containing replacement if anuric/AKI without senior plan.

📖 UK reference documents

• NHS England standards for concentrated potassium storage
• NICE CG174 adult IV fluids

Editorial status: Source checked for the specific statements above on 3 November 2026. References may be updated. This card has not had formal independent pharmacist/consultant approval; no unlisted indications, paediatric extrapolation or automatic renal-dose adjustments are implied.