Comparative Pharmacology
Head-to-head clinical analysis: POLYCILLIN N versus V CILLIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: POLYCILLIN N versus V CILLIN.
POLYCILLIN-N vs V-CILLIN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Ampicillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), disrupting peptidoglycan cross-linking, and activating autolytic enzymes. It is bactericidal against susceptible organisms.
Penicillin G (V-CILLIN) inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), inhibiting transpeptidase activity and autolysin activation, leading to cell lysis.
1-2 g IV/IM every 4-6 hours
250-500 mg orally every 8 hours or 500 mg every 12 hours for mild to moderate infections.
None Documented
None Documented
Terminal elimination half-life: 0.5-1 hour (normal renal function); increases to 7-10 hours in anuria. Prolonged in neonates (2-4 hours).
Terminal elimination half-life ~30-60 minutes in normal renal function; prolonged in renal impairment (up to 10 hours in anuria).
Renal: 60-80% unchanged via glomerular filtration and tubular secretion. Biliary: ~20% excreted in bile and feces. Small amount metabolized to penicilloic acid.
Primarily renal (60-70% unchanged via tubular secretion); minor biliary/fecal elimination (<10%).
Category C
Category C
Penicillin Antibiotic
Penicillin Antibiotic