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Pharmacology Antimicrobial Toxicity Beginner
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Aminoglycoside Major Toxicities

N
O
T
The three classical adverse effect categories of aminoglycoside antibiotics (Gentamicin, Tobramycin, Amikacin).

Aminoglycosides bind irreversibly to the 30S ribosomal subunit to cause mistranslation. Due to their cationic charge, they accumulate in the renal cortex and inner ear endolymph.

Systematic Breakdown

N

Nephrotoxicity

Acute tubular necrosis (ATN) manifested by muddy brown granular casts, non-oliguric renal failure, and rising serum creatinine. Usually reversible.

O

Ototoxicity

Cochlear damage (tinnitus, high-frequency hearing loss) and vestibular toxicity (vertigo, ataxia) due to hair cell apoptosis. IRREVERSIBLE.

T

Teratogen (CN VIII Deafness)

Can cross placenta and cause congenital permanent sensorineural bilateral hearing loss.

High-Yield Clinical Pearls & Exam Tips
  • Concomitant loop diuretics (Furosemide) dramatically potentiate both ototoxicity and nephrotoxicity.
  • Once-daily high-dose aminoglycoside dosing regimen takes advantage of concentration-dependent killing and post-antibiotic effect while minimizing trough toxicity.
  • Can also precipitate neuromuscular blockade by inhibiting presynaptic acetylcholine release (countered with IV calcium gluconate).
Related Pharmaceuticals
Gentamicin Tobramycin Amikacin Furosemide
Related Clinical Conditions
Acute Tubular Necrosis Sensorineural Hearing Loss Myasthenia Gravis
Authoritative Sources: Sanford Guide to Antimicrobial Therapy · First Aid USMLE Step 1

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