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Related Experiment Videos

Erythromycin-antacid interaction

M S Arayne1, N Sultana

  • 1Department of Chemistry, Faculty of Pharmacy, University of Karachi, Pakistan.

Die Pharmazie
|August 1, 1993
PubMed
Summary

The study found that most antacids significantly slow down erythromycin stearate release in vitro. Only sodium hydrogen carbonate did not affect the drug

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery
  • Pharmacokinetics

Background:

  • Erythromycin stearate is a common antibiotic.
  • Antacids are frequently co-administered with medications.
  • Interactions between antacids and antibiotics can affect drug efficacy.

Purpose of the Study:

  • To investigate the in vitro effect of various antacids on erythromycin stearate release.
  • To determine if antacids alter the dissolution profile of erythromycin stearate.
  • To explore the potential mechanisms behind any observed interactions.

Main Methods:

  • Utilized the United States Pharmacopeia (USP) XX dissolution method for in vitro testing.
  • Studied the release of erythromycin stearate in the presence of specific antacids: aluminium hydroxide, aluminium trisilicate, magnesium oxide, magnesium trisilicate, sodium hydrogen carbonate, and a combination formulation.
  • Compared dissolution rates with and without antacid presence.

Main Results:

  • A marked retardation in erythromycin stearate dissolution was observed with most tested antacids.
  • Aluminium hydroxide, aluminium trisilicate, magnesium oxide, magnesium trisilicate, and the combination formulation significantly inhibited drug release.
  • Sodium hydrogen carbonate was the only antacid that did not show a retarding effect on erythromycin stearate dissolution.

Conclusions:

  • Co-administration of erythromycin stearate with common antacids (excluding sodium hydrogen carbonate) can significantly impede its in vitro drug release.
  • The observed retarding effect suggests potential alterations in drug absorption or efficacy when erythromycin stearate is taken with these antacids.
  • Further investigation into the specific mechanisms of interaction is warranted to understand clinical implications.

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