Comparative Pharmacology
Head-to-head clinical analysis: DURACILLIN A S versus UNASYN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DURACILLIN A S versus UNASYN.
DURACILLIN A.S. vs UNASYN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Penicillin G procaine is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis and death.
Ampicillin inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs); sulbactam is a beta-lactamase inhibitor that prevents degradation of ampicillin by beta-lactamases.
600,000 units intramuscularly once daily; or 1.2 million units intramuscularly every 12 hours for severe infections.
3 g (ampicillin 2 g + sulbactam 1 g) IV every 6 hours; total daily dose of sulbactam not to exceed 4 g.
None Documented
None Documented
0.5-1 hour in adults with normal renal function; prolonged to 7-10 hours in end-stage renal disease
Ampicillin: ~1 hour (normal renal function); sulbactam: ~1-1.4 hours (normal renal function); prolonged in renal impairment (ampicillin up to 20 hours, sulbactam up to 10-15 hours in anuria).
Primarily renal (60-90% unchanged via tubular secretion and glomerular filtration); minor biliary/fecal elimination (<10%)
Renal: ampicillin (~75-90% unchanged) and sulbactam (~75-85% unchanged); biliary/fecal: minimal (<5% for each component).
Category C
Category C
Penicillin Antibiotic
Penicillin Antibiotic