Comparative Pharmacology
Head-to-head clinical analysis: AZASITE versus ERYTHROMYCIN ETHYLSUCCINATE AND SULFISOXAZOLE ACETYL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: AZASITE versus ERYTHROMYCIN ETHYLSUCCINATE AND SULFISOXAZOLE ACETYL.
AZASITE vs ERYTHROMYCIN ETHYLSUCCINATE AND SULFISOXAZOLE ACETYL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Azasite (azithromycin ophthalmic solution) is a macrolide antibiotic that binds to the 50S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis.
Erythromycin ethylsuccinate is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, blocking peptide chain elongation. Sulfisoxazole acetyl is a sulfonamide that inhibits dihydropteroate synthase, blocking folic acid synthesis.
1 drop of 1% ophthalmic solution to each affected eye twice daily (approximately 12 hours apart) for 2 days, then once daily for 5 days.
Erythromycin ethylsuccinate (400 mg) and sulfisoxazole acetyl (600 mg) per 5 mL suspension: 2-3 teaspoonfuls (10-15 mL) orally every 6 hours for 10-14 days. Maximum daily dose: 6 g sulfisoxazole.
None Documented
None Documented
Terminal elimination half-life: 68-72 hours; facilitates once-weekly dosing for trachoma.
Erythromycin: terminal half-life of 1.4-2.0 hours in adults; prolonged to 4-6 hours in anuria. Sulfisoxazole: half-life 4.5-7 hours in adults; increased in renal impairment. The combination's clinical context warrants dosing interval adjustments in renal dysfunction.
Primarily hepatic/biliary (fecal) as unchanged drug: ~70% fecal, ~20% renal (mostly unchanged), ~0.5% urinary as metabolites.
Erythromycin ethylsuccinate is primarily excreted in bile (up to 80% as unchanged drug), with about 12-15% eliminated renally. Sulfisoxazole acetyl is renally excreted, with approximately 85% of the dose appearing in urine as acetylated and deacetylated metabolites. Fecal elimination accounts for less than 10% of sulfisoxazole.
Category C
Category A/B
Macrolide Antibiotic
Macrolide Antibiotic