Comparative Pharmacology
Head-to-head clinical analysis: GENTACIDIN versus NEOMYCIN AND POLYMYXIN B SULFATES BACITRACIN ZINC AND HYDROCORTISONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: GENTACIDIN versus NEOMYCIN AND POLYMYXIN B SULFATES BACITRACIN ZINC AND HYDROCORTISONE.
GENTACIDIN vs NEOMYCIN AND POLYMYXIN B SULFATES, BACITRACIN ZINC AND HYDROCORTISONE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Aminoglycoside antibiotic that binds to the 30S ribosomal subunit, causing misreading of mRNA and inhibiting protein synthesis.
Neomycin, polymyxin B, and bacitracin are topical antibiotics that inhibit bacterial protein synthesis (neomycin and bacitracin) or disrupt bacterial cell membrane permeability (polymyxin B). Hydrocortisone is a corticosteroid that suppresses inflammation by inhibiting phospholipase A2, reducing prostaglandin and leukotriene synthesis.
5-7 mg/kg IV every 24 hours.
Apply a thin layer to the affected area 2 to 4 times daily. Ophthalmic: 1-2 drops or a small amount (1/2 inch ribbon) into the conjunctival sac every 4 hours, or more frequently in severe infections. Otic: 4 drops into the affected ear(s) 3-4 times daily. Topical: Apply 2-4 times daily. Route: Topical, ophthalmic, otic.
None Documented
None Documented
2-3 hours in adults with normal renal function; extended to 24-48 hours in anuria or severe renal impairment, requiring dose adjustment.
Neomycin: 2-3 hours for absorbed fraction (extensive variability). Polymyxin B: 6-7 hours (prolonged in renal impairment). Bacitracin: 1.5 hours (intramuscular data; topical: negligible). Hydrocortisone: 1.5-2 hours (topical absorption limited).
Renal: 95-98% unchanged via glomerular filtration; biliary/fecal: <2%.
Neomycin is primarily excreted unchanged in feces (97%) after oral administration; absorbed fraction is renally excreted. Polymyxin B is mainly eliminated via renal tubular secretion (60-70% unchanged in urine). Bacitracin is predominantly excreted renally (90% unchanged). Hydrocortisone is metabolized hepatically and metabolites are excreted renally. For topical ophthalmic/otic use: negligible systemic absorption; any absorbed drug follows the respective systemic routes.
Category C
Category A/B
Aminoglycoside Antibiotic
Aminoglycoside Antibiotic