Comparative Pharmacology
Head-to-head clinical analysis: CYCLAPEN W versus POLYCILLIN N.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CYCLAPEN W versus POLYCILLIN N.
CYCLAPEN-W vs POLYCILLIN-N
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Cyclacillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis and death. It has a similar spectrum to ampicillin but with increased acid stability and oral absorption.
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.
250-500 mg orally every 6 hours for mild to moderate infections; 500 mg orally every 6 hours for severe infections.
1-2 g IV/IM every 4-6 hours
None Documented
None Documented
0.5-1 hour in adults with normal renal function; prolonged to 2-6 hours in renal impairment.
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 (90-100% unchanged via glomerular filtration and tubular secretion); minor biliary/fecal elimination (<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 C
Category C
Penicillin Antibiotic
Penicillin Antibiotic