Ketoconazole and Loratadine: Drug Interaction Guide

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

Interaction severity: Minor — typically manageable

How Ketoconazole interacts with Loratadine

Ketoconazole inhibits CYP3A4 and P-glycoprotein, increasing loratadine and desloratadine exposure. This increase is usually not clinically important at standard loratadine doses.

What you should do

Routine dose adjustment is generally unnecessary. Monitor for increased antihistamine adverse effects in susceptible patients.

Key facts

Severity

Minor — typically manageable

Mechanism

Ketoconazole inhibits CYP3A4 and P-glycoprotein, increasing loratadine and desloratadine exposure. This increase is usua...

Action

Routine dose adjustment is generally unnecessary. Monitor for increased antihistamine adverse effects in susceptible pat...

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 Ketoconazole and Loratadine together?

Usually yes, with awareness. Routine dose adjustment is generally unnecessary. Monitor for increased antihistamine adverse effects in susceptible patients.

What is the severity of this interaction?

The interaction between Ketoconazole and Loratadine is classified as Minor — typically manageable. Ketoconazole inhibits CYP3A4 and P-glycoprotein, increasing loratadine and desloratadine exposure. This increase is usually not clinically important at standard loratadine doses.

What should I do if I'm prescribed both?

Routine dose adjustment is generally unnecessary. Monitor for increased antihistamine adverse effects in susceptible patients. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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