4.4 Article

The effect of erythromycin and clarithromycin versus azithromycin on serum valproate concentration

Journal

SAUDI PHARMACEUTICAL JOURNAL
Volume 30, Issue 4, Pages 337-339

Publisher

ELSEVIER
DOI: 10.1016/j.jsps.2022.02.004

Keywords

Interaction; Macrolide; Clarithromycin; Erythromycin; Azithromycin

Ask authors/readers for more resources

This study found a significantly higher increase in serum trough levels of valproate after coadministration of erythromycin/clarithromycin compared to azithromycin. Clinicians should consider avoiding concurrent use of erythromycin and clarithromycin with valproate, if possible, or closely monitor valproate levels and reduce the dosage.
Introduction: Unlike azithromycin, erythromycin and clarithromycin strongly inhibit CYP450, which metabolizes valproic acid. The aim of this study was to evaluate the impact of macrolide administration on serum valproate trough levels. Methods: This retrospective cohort study included hospitalized adult patients who concomitantly received valproate with a macrolide. Patients who received a carbapenem, those who do not have a baseline and/or post-levels, and those who received different doses of valproate were excluded. The change in serum valproate trough level from baseline to after the occurrence of co-administration (post-level) was compared in patients who received either erythromycin or clarithromycin versus those who received azithromycin. Results: A total of thirteen patients were included in the comparison. The mean +/- SD for change in serum valproate trough levels was significantly higher in the erythromycin/clarithromycin group than the azithromycin group (209.1 +/- 105.9 mmol/L [equivalent to 30.1 +/- 15.2 mg/L] vs. 12.7 +/- 52.1 mmol/L [equivalent to 1.8 +/- 7.5 mg/L]; P = 0.002). Conclusion: This study found a significantly higher increase in serum trough levels of valproate after coadministration of erythromycin/clarithromycin versus azithromycin. Clinicians should consider avoiding co-administration of erythromycin and clarithromycin with valproate if possible or close monitoring of valproate levels with dose reduction. (c) 2022 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.4
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available