Erythromycin and Loratadine: Drug Interaction Guide

Quick answer: Erythromycin and Loratadine have a minor interaction — typically manageable with awareness.

Interaction severity: Minor — typically manageable

How Erythromycin interacts with Loratadine

Erythromycin inhibits CYP3A4-mediated loratadine metabolism, increasing loratadine and active-metabolite exposure; clinically important cardiac effects are uncommon at usual doses.

What you should do

Routine dose adjustment is generally unnecessary. Use additional caution in patients with substantial QT-risk factors or severe hepatic impairment.

Key facts

Severity

Minor — typically manageable

Mechanism

Erythromycin inhibits CYP3A4-mediated loratadine metabolism, increasing loratadine and active-metabolite exposure; clini...

Action

Routine dose adjustment is generally unnecessary. Use additional caution in patients with substantial QT-risk factors or...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Erythromycin and Loratadine together?

Usually yes, with awareness. Routine dose adjustment is generally unnecessary. Use additional caution in patients with substantial QT-risk factors or severe hepatic impairment.

What is the severity of this interaction?

The interaction between Erythromycin and Loratadine is classified as Minor — typically manageable. Erythromycin inhibits CYP3A4-mediated loratadine metabolism, increasing loratadine and active-metabolite exposure; clinically important cardiac effects are uncommon at usual doses.

What should I do if I'm prescribed both?

Routine dose adjustment is generally unnecessary. Use additional caution in patients with substantial QT-risk factors or severe hepatic impairment. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.