Comparative Pharmacology
Head-to-head clinical analysis: BACITRACIN ZINC NEOMYCIN SULFATE POLYMYXIN B SULFATE versus GENTAK.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BACITRACIN ZINC NEOMYCIN SULFATE POLYMYXIN B SULFATE versus GENTAK.
BACITRACIN ZINC-NEOMYCIN SULFATE-POLYMYXIN B SULFATE vs GENTAK
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Bacitracin zinc inhibits bacterial cell wall synthesis by interfering with dephosphorylation of the lipid carrier that transports peptidoglycan precursors. Neomycin sulfate and polymyxin B sulfate are aminoglycoside and polypeptide antibiotics, respectively; neomycin binds to 30S ribosomal subunit and causes misreading of mRNA, while polymyxin B disrupts bacterial cell membrane permeability by interacting with phospholipids.
Gentamicin is an aminoglycoside antibiotic that binds to the 30S ribosomal subunit of susceptible bacteria, causing misreading of mRNA and inhibiting protein synthesis, leading to bacterial cell death.
Apply topically (ointment or cream) to affected area 1-3 times daily. For ophthalmic use, instill 1-2 drops into affected eye(s) every 3-4 hours.
Gentamicin 3-5 mg/kg IV or IM once daily; alternatively, 1.5-2.5 mg/kg IV or IM every 8 hours.
None Documented
None Documented
Neomycin: 2-3 h; polymyxin B: 4.5-6 h; bacitracin: 1.5 h. Combined: effectively ~2-6 h depending on renal function; clinical context: prolonged with renal impairment.
2–3 hours in adults with normal renal function; prolonged to 24–60 hours in severe renal impairment (CrCl <10 mL/min).
Neomycin: ~99% renal; polymyxin B: ~60% renal, 40% fecal; bacitracin: mainly renal (over 90%). Combined: renal (predominant), with minor biliary/fecal contribution (polymyxin B).
Renal excretion of unchanged drug accounts for >90% of elimination; <5% biliary/fecal.
Category A/B
Category C
Aminoglycoside Antibiotic
Aminoglycoside Antibiotic