Comparative Pharmacology
Head-to-head clinical analysis: BICILLIN L A versus DYCILL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BICILLIN L A versus DYCILL.
BICILLIN L-A vs DYCILL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Penicillin G benzathine is a slow-release formulation that provides prolonged tissue concentrations. It inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), inhibiting transpeptidation, and activating autolytic enzymes, leading to cell lysis.
Penicillin G benzathine is a slow-release parenteral formulation of penicillin G that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), inhibiting transpeptidation, and activating autolytic enzymes.
1.2 million units intramuscularly as a single dose for treatment of streptococcal pharyngitis; for syphilis, 2.4 million units intramuscularly weekly for 1-3 weeks depending on stage.
250 mg orally every 6 hours or 500 mg orally every 12 hours.
None Documented
None Documented
Terminal half-life: 30-60 hours (prolonged due to slow absorption from IM depot; clinically allows single-dose regimen for syphilis)
0.5-1 hour; prolonged in renal impairment (up to 20 hours in severe cases).
Renal: 60-90% unchanged; biliary/fecal: minor (<10%)
Renal: approx. 60-80% unchanged by glomerular filtration and tubular secretion. Biliary/fecal: minor (less than 10%).
Category C
Category C
Penicillin Antibiotic
Penicillin Antibiotic