Comparative Pharmacology
Head-to-head clinical analysis: AZITHROMYCIN versus BIAXIN XL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: AZITHROMYCIN versus BIAXIN XL.
AZITHROMYCIN vs BIAXIN XL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Binds to the 50S ribosomal subunit of susceptible bacteria, inhibiting mRNA translation and thus protein synthesis. Exhibits concentration-dependent bactericidal activity.
Clarithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, blocking peptide chain elongation.
500 mg orally once daily for 3 days, or 500 mg IV once daily for at least 2 days followed by 500 mg orally to complete 7-10 days of therapy for community-acquired pneumonia. For other indications, typical adult dose is 500 mg orally on day 1 then 250 mg orally once daily on days 2-5.
500 mg orally once daily for 7 to 14 days
None Documented
None Documented
Clinical Note
moderateAzithromycin + Norfloxacin
"Azithromycin may increase the QTc-prolonging activities of Norfloxacin."
Clinical Note
moderateAzithromycin + Ibandronate
"Azithromycin may increase the QTc-prolonging activities of Ibandronate."
Clinical Note
moderateAzithromycin + Indapamide
"Azithromycin may increase the QTc-prolonging activities of Indapamide."
Clinical Note
moderateAzithromycin + Artesunate
"The serum concentration of the active metabolites of Artesunate can be reduced when Artesunate is used in combination with Azithromycin resulting in a loss in efficacy."
Terminal half-life of approximately 68 hours (range 35–96 h) after multiple doses, allowing once-daily dosing and a prolonged post-antibiotic effect.
Terminal elimination half-life is 5-7 hours in healthy adults; prolonged to 20-40 hours in patients with severe hepatic impairment (Child-Pugh Class C).
Primarily biliary/fecal (approx. 50% unchanged); renal excretion accounts for about 12% of the dose.
Approximately 20-30% of the dose is excreted unchanged in urine, with the remainder as metabolites (primarily via biliary/fecal elimination). Renal clearance accounts for about 12% of total clearance.
Category A/B
Category C
Macrolide Antibiotic
Macrolide Antibiotic