👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Pharmacological Therapies🔖 Free to read, print, and share
Also known as: KCl · potassium supplement · K+
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Use this quick-reference guide to spot, treat, and prevent Potassium Chloride on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
🧪 Range
Normal K+ 3.5-5.0 mEq/L
Treats hypokalemia
📌 Never
NEVER IV push/bolus → cardiac arrest
Always dilute, infusion pump
✅ Do
Max 10 mEq/hr peripheral
PO with food, full glass
Check urine output first
🚩 Report
Burning/pain at IV site
Peaked T waves, weakness, dysrhythmia
📚 Potassium Chloride — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Potassium chloride is an electrolyte replacement for hypokalemia, which is common with diuretics, vomiting, and diarrhea. Potassium is essential for cardiac and muscle function. Key principle: IV potassium is high-alert; never give it IV push, and always dilute and infuse it slowly with a pump.
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Key points
Understand these first
IV potassium is NEVER given by IV push or bolus; it is always diluted and given slowly via pump.
The maximum peripheral infusion rate is usually 10 mEq/hour to prevent fatal arrhythmias.
Hypokalemia and hyperkalemia both cause life-threatening cardiac arrhythmias.
Oral potassium is irritating to the GI tract and is taken with food and a full glass of water.
Adequate urine output must be confirmed before giving potassium, because the kidneys excrete it.
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Nursing priorities
What to do, in order
Verify urine output of at least 30 mL/hour before administering potassium.
Always dilute IV potassium and infuse with a pump; never push it.
Monitor cardiac rhythm and serum potassium during replacement.
Assess the IV site for infiltration and pain; potassium is irritating.
Give oral doses with food and full water to reduce GI irritation.
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Red flags — report now
Escalate immediately
Never give potassium by IV push (fatal arrhythmia and cardiac arrest).
Report potassium below 3.5 or above 5.0 mEq/L with ECG changes.
Report decreased urine output before continuing potassium.
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Labs & values
Numbers to know
Potassium 3.5-5.0 mEq/L
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Patient teaching
What patients must know
Take oral potassium with food and a full glass of water; do not crush extended-release forms.
Report muscle weakness, cramps, or irregular heartbeat.
Eat potassium-rich foods and follow lab monitoring as directed.
❓ Potassium Chloride: NCLEX FAQs
What are the priority nursing interventions for Potassium Chloride?
Verify urine output of at least 30 mL/hour before administering potassium. Always dilute IV potassium and infuse with a pump; never push it. Monitor cardiac rhythm and serum potassium during replacement. Assess the IV site for infiltration and pain; potassium is irritating.
What are the warning signs of Potassium Chloride a nurse must report?
Never give potassium by IV push (fatal arrhythmia and cardiac arrest). Report potassium below 3.5 or above 5.0 mEq/L with ECG changes. Report decreased urine output before continuing potassium.
What do I need to know about Potassium Chloride for the NCLEX?
IV potassium is NEVER given by IV push or bolus; it is always diluted and given slowly via pump. The maximum peripheral infusion rate is usually 10 mEq/hour to prevent fatal arrhythmias. Hypokalemia and hyperkalemia both cause life-threatening cardiac arrhythmias. Oral potassium is irritating to the GI tract and is taken with food and a full glass of water.
What patient teaching is important for Potassium Chloride?
Take oral potassium with food and a full glass of water; do not crush extended-release forms. Report muscle weakness, cramps, or irregular heartbeat. Eat potassium-rich foods and follow lab monitoring as directed.
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Quick Tip
IV potassium is NEVER given by IV push or bolus; it is always diluted and given slowly via pump.