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Related Experiment Videos

Erythromycin, clarithromycin, and azithromycin: are the differences real?

G W Amsden1

  • 1Clinical Drug Research Center, St. Vincent Hospital, Worcester, Massachusetts, USA.

Clinical Therapeutics
|January 1, 1996
PubMed
Summary

Erythromycin, clarithromycin, and azithromycin are effective antibiotics for common infections. Azithromycin offers improved tolerability and better activity against Haemophilus influenzae, aiding judicious treatment selection.

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Area of Science:

  • Pharmacology and Microbiology
  • Infectious Diseases

Background:

  • Erythromycin, clarithromycin (macrolides), and azithromycin (azalide) are key antibiotics for respiratory and skin infections.
  • These agents also treat Chlamydia trachomatis infections like nongonococcal urethritis and cervicitis.
  • Clinical use is often hampered by misunderstandings regarding their pharmacokinetic and pharmacodynamic differences.

Purpose of the Study:

  • To clarify the distinctions among erythromycin, clarithromycin, and azithromycin.
  • To compare their pharmacokinetics, pharmacodynamics, spectrum of activity, safety profiles, and costs.
  • To guide the selection of appropriate macrolide/azalide therapy for specific infections.

Main Methods:

  • Analysis of pharmacokinetic data, including half-life, tissue distribution, and drug interactions.

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  • Evaluation of microbiologic data on susceptibility patterns, particularly for Gram-positive pathogens and Haemophilus influenzae.
  • Review of safety data, focusing on drug interactions and pregnancy classifications.

    • Main Results:

    • Azithromycin and clarithromycin show improved tolerability over erythromycin.
    • Azithromycin demonstrates significantly greater activity against Haemophilus influenzae compared to erythromycin and clarithromycin.
    • Pharmacokinetic drug interactions with theophylline, terfenadine, and carbamazepine are noted for erythromycin and clarithromycin but not azithromycin.
    • Erythromycin and azithromycin are Pregnancy Category B; clarithromycin is Category C.

    Conclusions:

    • Differences in pharmacokinetics, microbiology, safety, and cost necessitate careful consideration for optimal antibiotic selection.
    • Azithromycin's distinct profile may offer advantages in certain respiratory and Chlamydia infections.
    • Understanding these variations is crucial for effective and safe antimicrobial therapy.