Comparative Pharmacology
Head-to-head clinical analysis: BETHKIS versus NEOMYCIN SULFATE POLYMYXIN B SULFATE HYDROCORTISONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BETHKIS versus NEOMYCIN SULFATE POLYMYXIN B SULFATE HYDROCORTISONE.
BETHKIS vs NEOMYCIN SULFATE-POLYMYXIN B SULFATE-HYDROCORTISONE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Tobramycin, an aminoglycoside antibiotic, binds to the 30S ribosomal subunit, causing misreading of mRNA and inhibiting protein synthesis, leading to bacterial 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.
4 IU/kg (1 mg/kg) intramuscularly or subcutaneously once weekly for 4 weeks, then a maintenance dose of 2 IU/kg (0.5 mg/kg) once weekly.
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
Terminal elimination half-life 2-3 hours in patients with normal renal function; prolonged to 20-40 hours in severe renal impairment (CrCl <30 mL/min).
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.
Primarily renal excretion of unchanged drug via glomerular filtration; ~90% of absorbed dose excreted in urine within 24 hours; biliary/fecal elimination <5%.
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