Penetration of erythromycin into tonsillar tissue

Area of Science:

• Pharmacology
• Otolaryngology
• Infectious Diseases

Background:

• Chronic tonsillitis is a common condition in children requiring surgical intervention.
• Understanding antibiotic penetration into tonsillar tissue is crucial for effective treatment.
• Erythromycin is frequently prescribed for upper respiratory tract infections.

Purpose of the Study:

• To investigate the serum and tonsillar tissue levels of erythromycin in children with chronic tonsillitis.
• To determine the pharmacokinetic profile of erythromycin ethyl succinate in this patient population.

Main Methods:

• Eighty children undergoing tonsillectomy for chronic tonsillitis received oral erythromycin ethyl succinate (1 g twice daily) for two days prior to surgery.
• Blood and tonsillar tissue samples were collected at various time points (2, 3, 4, or 6 hours) after the last dose.
• Erythromycin concentrations in serum and tissue were quantified.

Main Results:

• Erythromycin demonstrated rapid penetration into tonsillar tissue.
• Tonsillar tissue concentrations of erythromycin were consistently higher than serum concentrations at all measured time points.
• Mean erythromycin levels in tonsillar tissue exceeded the minimum inhibitory concentrations (MICs) for common Gram-positive oro-pharyngeal pathogens and Haemophilus influenzae.

Conclusions:

• Erythromycin ethyl succinate achieves significant concentrations within tonsillar tissue, suggesting its potential efficacy in treating chronic tonsillitis.
• The drug's pharmacokinetic profile supports its use in managing infections involving oro-pharyngeal pathogens.
• Further clinical studies may be warranted to confirm therapeutic benefits.