👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Pharmacological Therapies🔖 Free to read, print, and share
Also known as: ciprofloxacin · Cipro · levofloxacin · Levaquin · moxifloxacin · the -floxacins
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Use this quick-reference guide to spot, treat, and prevent Fluoroquinolones on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Use
UTI, respiratory, GI "-floxacin"
Blocks DNA gyrase → cidal
🚩 Danger
Tendon rupture (Achilles)
QT prolongation, dysrhythmia
Avoid <18 yrs, pregnancy
🎓 Teach
Separate dairy/antacid/iron 2 hr
Photosensitivity → sunscreen
🚩 Report
Tendon pain → stop drug
Palpitations, confusion
📚 Fluoroquinolones — 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.
Fluoroquinolones are broad-spectrum bactericidal antibiotics used for complicated UTIs, respiratory infections, and GI infections. They carry serious black box warnings for tendon rupture, peripheral neuropathy, and QT prolongation. The key principle is reserving them when other options fail because of these significant risks.
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Key points
Understand these first
Fluoroquinolones are bactericidal and inhibit bacterial DNA gyrase and topoisomerase.
They carry a black box warning for tendinitis and tendon rupture, especially the Achilles tendon.
They can prolong the QT interval and cause dangerous arrhythmias.
Antacids, iron, calcium, zinc, and dairy reduce absorption through chelation.
They may cause peripheral neuropathy, CNS effects, and lower the seizure threshold.
They can raise blood glucose or cause hypoglycemia in diabetic patients on insulin or sulfonylureas.
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Nursing priorities
What to do, in order
Assess for and educate about tendon pain or swelling and stop the drug if it occurs.
Separate the dose from antacids, dairy, and mineral supplements by at least 2 hours.
Monitor the ECG and electrolytes in patients at risk for QT prolongation.
Monitor blood glucose closely in diabetic patients.
Encourage adequate fluid intake to prevent crystalluria.
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Red flags — report now
Escalate immediately
Tendon pain, swelling, or a sudden pop signals possible rupture - stop the drug and report immediately.
New numbness, tingling, or weakness suggests peripheral neuropathy and must be reported.
Palpitations, syncope, or signs of arrhythmia require prompt evaluation.
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Labs & values
Numbers to know
Blood glucose 70-110 mg/dL fasting (monitor in diabetics)
Potassium 3.5-5.0 mEq/L (correct before QT-prolonging drugs)
Magnesium 1.5-2.5 mEq/L (correct to reduce arrhythmia risk)
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Patient teaching
What patients must know
Stop the medication and call your provider if you feel tendon pain or swelling, and avoid strenuous exercise.
Avoid antacids, dairy, and iron or calcium supplements within 2 hours of the dose.
Limit sun exposure and use sunscreen because of photosensitivity.
Report numbness, tingling, confusion, or palpitations.
❓ Fluoroquinolones: NCLEX FAQs
What are the priority nursing interventions for Fluoroquinolones?
Assess for and educate about tendon pain or swelling and stop the drug if it occurs. Separate the dose from antacids, dairy, and mineral supplements by at least 2 hours. Monitor the ECG and electrolytes in patients at risk for QT prolongation. Monitor blood glucose closely in diabetic patients.
What are the warning signs of Fluoroquinolones a nurse must report?
Tendon pain, swelling, or a sudden pop signals possible rupture - stop the drug and report immediately. New numbness, tingling, or weakness suggests peripheral neuropathy and must be reported. Palpitations, syncope, or signs of arrhythmia require prompt evaluation.
What do I need to know about Fluoroquinolones for the NCLEX?
Fluoroquinolones are bactericidal and inhibit bacterial DNA gyrase and topoisomerase. They carry a black box warning for tendinitis and tendon rupture, especially the Achilles tendon. They can prolong the QT interval and cause dangerous arrhythmias. Antacids, iron, calcium, zinc, and dairy reduce absorption through chelation.
What patient teaching is important for Fluoroquinolones?
Stop the medication and call your provider if you feel tendon pain or swelling, and avoid strenuous exercise. Avoid antacids, dairy, and iron or calcium supplements within 2 hours of the dose. Limit sun exposure and use sunscreen because of photosensitivity. Report numbness, tingling, confusion, or palpitations.
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Quick Tip
Fluoroquinolones are bactericidal and inhibit bacterial DNA gyrase and topoisomerase.