Comparative Pharmacology
Head-to-head clinical analysis: GENTAFAIR versus NEOMYCIN AND POLYMYXIN B SULFATES AND HYDROCORTISONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: GENTAFAIR versus NEOMYCIN AND POLYMYXIN B SULFATES AND HYDROCORTISONE.
GENTAFAIR vs NEOMYCIN AND POLYMYXIN B SULFATES AND 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 is an aminoglycoside antibiotic that binds to the 30S ribosomal subunit, inhibiting bacterial protein synthesis. Polymyxin B is a cationic detergent 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.
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.
Instill 3 to 4 drops into the affected ear(s) 3 to 4 times daily. For otic suspension in adults.
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 (in adults with normal renal function); may accumulate in renal impairment. Polymyxin B: 6-8 hours (prolonged in renal impairment: up to 36 hours). Hydrocortisone: 1.2-1.5 hours (terminal).
Renal: over 90% unchanged via glomerular filtration; minor biliary (<1%).
Neomycin: >90% unchanged in feces after oral administration; negligible renal excretion. Polymyxin B: 60% renal excretion of unchanged drug; remainder nonrenal. Hydrocortisone: primarily hepatic metabolism, <5% renal excretion unchanged.
Category C
Category A/B
Aminoglycoside Antibiotic
Aminoglycoside Antibiotic