Comparative Pharmacology
Head-to-head clinical analysis: PENICILLIN G SODIUM versus POLYCILLIN N.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PENICILLIN G SODIUM versus POLYCILLIN N.
PENICILLIN G SODIUM vs POLYCILLIN-N
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Penicillin G inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), inhibiting transpeptidase activity, and activating autolytic enzymes.
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.
2-4 million units intravenously every 4 hours for moderate to severe infections; up to 24 million units/day for severe infections (e.g., meningitis, endocarditis).
1-2 g IV/IM every 4-6 hours
None Documented
None Documented
30-60 minutes in normal renal function; prolonged to 7-10 hours in anuria.
Terminal elimination half-life: 0.5-1 hour (normal renal function); increases to 7-10 hours in anuria. Prolonged in neonates (2-4 hours).
Primarily renal (60-90% unchanged) via glomerular filtration and tubular secretion; minor biliary/fecal (<10%).
Renal: 60-80% unchanged via glomerular filtration and tubular secretion. Biliary: ~20% excreted in bile and feces. Small amount metabolized to penicilloic acid.
Category A/B
Category C
Penicillin Antibiotic
Penicillin Antibiotic