Fluoroquinolone vs Aminoglycoside — Black Box Warnings Comparison
Both drug classes carry FDA black box warnings, but choosing the wrong monitoring parameter means you miss the toxicity entirely. Fluoroquinolones destroy tendons and nerves; aminoglycosides destroy kidneys and hearing. Mix them up on the NCLEX and you'll monitor peak/trough levels for a drug that needs a tendon assessment — or vice versa.
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- Inhibit DNA gyrase/topoisomerase IV
- 30S protein synthesis inhibitor
- UTI, respiratory, GI
- Broad-spectrum
- Serious gram-negative infection, sepsis
- PO or IV
- Excellent oral absorption
- IV/IM only (poor oral absorption)
- Narrow therapeutic index
- Assess renal function before dosing
- Tendon pain, new numbness/tingling
- Assess renal function before dosing
- Baseline hearing & balance
- Blood glucose (dysglycemia)
- ECG for QT if at risk
- ★Peak & trough levels
- High trough = toxicity risk
- Serial BUN/creatinine
- QT prolongation
- Phototoxicity
- C. diff
- Aortic aneurysm/dissection
- Neuromuscular blockade (resp depression)
- ★Tendon rupture
- Peripheral neuropathy
- Worsens myasthenia gravis
- ★Nephrotoxicity
- ★Ototoxicity, often permanent
- Worsens myasthenia gravis
- Avoid in children (cartilage risk)
- Caution with other nephro/ototoxic drugs
- Separate from antacids, dairy, iron
- Tendon pain: stop drug, call provider
- Report tinnitus, hearing loss, dizziness
Fluoroquinolones
- Inhibit DNA gyrase/topoisomerase IV
Aminoglycosides
- 30S protein synthesis inhibitor
Fluoroquinolones
- UTI, respiratory, GI
- Broad-spectrum
Aminoglycosides
- Serious gram-negative infection, sepsis
Fluoroquinolones
- PO or IV
- Excellent oral absorption
Aminoglycosides
- IV/IM only (poor oral absorption)
- Narrow therapeutic index
Fluoroquinolones
- Assess renal function before dosing
- Tendon pain, new numbness/tingling
Aminoglycosides
- Assess renal function before dosing
- Baseline hearing & balance
Fluoroquinolones
- Blood glucose (dysglycemia)
- ECG for QT if at risk
Aminoglycosides
- ★Peak & trough levels
- High trough = toxicity risk
- Serial BUN/creatinine
Fluoroquinolones
- QT prolongation
- Phototoxicity
- C. diff
- Aortic aneurysm/dissection
Aminoglycosides
- Neuromuscular blockade (resp depression)
Fluoroquinolones
- ★Tendon rupture
- Peripheral neuropathy
- Worsens myasthenia gravis
Aminoglycosides
- ★Nephrotoxicity
- ★Ototoxicity, often permanent
- Worsens myasthenia gravis
Fluoroquinolones
- Avoid in children (cartilage risk)
Aminoglycosides
- Caution with other nephro/ototoxic drugs
Fluoroquinolones
- Separate from antacids, dairy, iron
- Tendon pain: stop drug, call provider
Aminoglycosides
- Report tinnitus, hearing loss, dizziness
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Fluoro-TENDON-olone hurts tendons and nerves; Amino-GLYCO-sides gut your kidneys and ears — different targets entirely.
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