Comparative Pharmacology
Head-to-head clinical analysis: DYNABAC versus E E S.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DYNABAC versus E E S.
DYNABAC vs E.E.S.
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Dirithromycin is a macrolide antibiotic that binds to the 50S subunit of the bacterial ribosome, specifically to the 23S rRNA, inhibiting peptide chain elongation by blocking the translocation step. It also interferes with the assembly of the 50S ribosomal subunit. This action is primarily bacteriostatic but can be bactericidal at higher concentrations.
Erythromycin (E.E.S.) binds to the 50S subunit of bacterial ribosomes, inhibiting peptide chain elongation and protein synthesis. It also exhibits prokinetic effects on the gastrointestinal tract via motilin receptor agonism.
500 mg orally once daily or 250 mg orally twice daily; usual duration 5-14 days depending on infection
250-500 mg every 6 hours orally or 15-20 mg/kg/day IV divided every 6 hours.
None Documented
None Documented
Terminal elimination half-life is 9–12 hours in adults with normal renal function; may extend to 20–30 hours in severe renal impairment (CrCl <30 mL/min).
1.5-2 hours in adults with normal renal function; prolonged to 4-6 hours in patients with hepatic impairment; may be shorter in children.
Approximately 65% of a dose is excreted unchanged in the urine via glomerular filtration and tubular secretion; about 15% is excreted unchanged in the bile; fecal elimination accounts for <5%.
Primarily hepatic (biliary) excretion of unchanged drug and active metabolites; approximately 15% of an oral dose is excreted unchanged in urine. The remainder is eliminated via feces as unchanged drug and metabolites.
Category C
Category C
Macrolide Antibiotic
Macrolide Antibiotic