side by side comparison

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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Comparison

Side-by-side2 compared
Dimension
Fluoroquinolones
Aminoglycosides
Class & mechanism
  • Inhibit DNA gyrase/topoisomerase IV
  • Bind 30S then block protein synthesis (cidal)
Indications
  • UTI, respiratory, GI
  • broad-spectrum
  • Serious gram-negative infection, sepsis
Route & PK
  • PO or IV
  • excellent oral absorption
  • IV/IM only
  • narrow therapeutic index
Key assessment
  • Assess renal function before dosing
  • Tendon pain, new numbness/tingling
  • Assess renal function before dosing
  • Baseline hearing & balance
Monitoring labs
  • Glucose (dysglycemia)
  • ECG QT if at risk
  • ★Peak & trough levels
  • trough = toxicity
  • Serial BUN/creatinine
Adverse effects
  • QT prolongation
  • phototoxicity
  • C. diff
  • dysglycemia
  • Neuromuscular blockade (resp depression)
Black box & toxicity
  • ★Tendon rupture, neuropathy, aortic aneurysm
  • ★Nephrotoxicity + ototoxicity (may be permanent)
Contraindications & interactions
  • Avoid in children & pregnancy
  • Caution with other nephro/ototoxic drugs
Patient teaching
  • Separate from antacids/dairy/cations (chelation)
  • Report tendon pain
  • stop and call
  • Report ringing, hearing loss, or dizziness
Class & mechanism

Fluoroquinolones

  • Inhibit DNA gyrase/topoisomerase IV

Aminoglycosides

  • Bind 30S then block protein synthesis (cidal)
Indications

Fluoroquinolones

  • UTI, respiratory, GI
  • broad-spectrum

Aminoglycosides

  • Serious gram-negative infection, sepsis
Route & PK

Fluoroquinolones

  • PO or IV
  • excellent oral absorption

Aminoglycosides

  • IV/IM only
  • narrow therapeutic index
Key assessment

Fluoroquinolones

  • Assess renal function before dosing
  • Tendon pain, new numbness/tingling

Aminoglycosides

  • Assess renal function before dosing
  • Baseline hearing & balance
Monitoring labs

Fluoroquinolones

  • Glucose (dysglycemia)
  • ECG QT if at risk

Aminoglycosides

  • ★Peak & trough levels
  • trough = toxicity
  • Serial BUN/creatinine
Adverse effects

Fluoroquinolones

  • QT prolongation
  • phototoxicity
  • C. diff
  • dysglycemia

Aminoglycosides

  • Neuromuscular blockade (resp depression)
Black box & toxicity

Fluoroquinolones

  • ★Tendon rupture, neuropathy, aortic aneurysm

Aminoglycosides

  • ★Nephrotoxicity + ototoxicity (may be permanent)
Contraindications & interactions

Fluoroquinolones

  • Avoid in children & pregnancy

Aminoglycosides

  • Caution with other nephro/ototoxic drugs
Patient teaching

Fluoroquinolones

  • Separate from antacids/dairy/cations (chelation)
  • Report tendon pain
  • stop and call

Aminoglycosides

  • Report ringing, hearing loss, or dizziness

★ marks the fact that sets a column apart.

Clinical Pearl

Fluoro-TENDON-olone hurts tendons and nerves; Amino-GLYCO-sides gut your kidneys and ears — different targets entirely.

Component Topics

AminoglycosidesFluoroquinolones

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