Colestyramine and Hydrochlorothiazide: Drug Interaction Guide

Quick answer: Colestyramine and Hydrochlorothiazide have a minor interaction — typically manageable with awareness.

Interaction severity: Minor — typically manageable

How Colestyramine interacts with Hydrochlorothiazide

Colestyramine binds hydrochlorothiazide in the gastrointestinal tract and can modestly reduce its absorption.

What you should do

Administer hydrochlorothiazide at least one hour before or four to six hours after colestyramine. Monitor blood pressure if control changes.

Key facts

Severity

Minor — typically manageable

Mechanism

Colestyramine binds hydrochlorothiazide in the gastrointestinal tract and can modestly reduce its absorption.

Action

Administer hydrochlorothiazide at least one hour before or four to six hours after colestyramine. Monitor blood pressure...

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 Colestyramine and Hydrochlorothiazide together?

Usually yes, with awareness. Administer hydrochlorothiazide at least one hour before or four to six hours after colestyramine. Monitor blood pressure if control changes.

What is the severity of this interaction?

The interaction between Colestyramine and Hydrochlorothiazide is classified as Minor — typically manageable. Colestyramine binds hydrochlorothiazide in the gastrointestinal tract and can modestly reduce its absorption.

What should I do if I'm prescribed both?

Administer hydrochlorothiazide at least one hour before or four to six hours after colestyramine. Monitor blood pressure if control changes. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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