Comparative Pharmacology
Head-to-head clinical analysis: GENTAFAIR versus NEOMYCIN SULFATE POLYMYXIN B SULFATE HYDROCORTISONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: GENTAFAIR versus NEOMYCIN SULFATE POLYMYXIN B SULFATE HYDROCORTISONE.
GENTAFAIR vs NEOMYCIN SULFATE-POLYMYXIN B SULFATE-HYDROCORTISONE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Gentamicin is an aminoglycoside antibiotic that binds to the 30S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis and causing misreading of mRNA, leading to cell death.
Neomycin sulfate is an aminoglycoside antibiotic that binds to the 30S ribosomal subunit, causing misreading of mRNA and inhibiting protein synthesis in susceptible bacteria. Polymyxin B sulfate is a polypeptide antibiotic that disrupts bacterial cell membrane integrity by interacting with phospholipids. Hydrocortisone is a corticosteroid that suppresses inflammation by inhibiting phospholipase A2, reducing prostaglandin and leukotriene synthesis, and modulating immune cell activity.
Gentamicin 3-5 mg/kg IV or IM once daily for serious infections; alternatively, 1.5-2 mg/kg IV or IM every 8 hours.
Otic: Instill 3-5 drops into the affected ear(s) 3-4 times daily; for acute otitis externa, a wick may be used initially.
None Documented
None Documented
2-3 hours (normal renal function); may extend to 24-48 hours in severe renal impairment, necessitating dose adjustment.
Neomycin: 2-3 hours (renal impairment: up to 12-24 hours). Polymyxin B: 4.5-6 hours (prolonged in renal failure). Hydrocortisone: 1.5-2 hours.
Renal: over 90% unchanged via glomerular filtration; minor biliary (<1%).
Neomycin is excreted primarily unchanged in feces (97%) after oral administration; absorbed fraction is renally excreted (30-50%). Polymyxin B is renally excreted (60%) with some biliary excretion. Hydrocortisone is metabolized hepatically and excreted renally as conjugates.
Category C
Category A/B
Aminoglycoside Antibiotic
Aminoglycoside Antibiotic