PlainMeds provides educational information only. This is not medical advice. Always consult your doctor or pharmacist.

Colestipol and Olmesartan Interaction

Drug interaction information between Colestipol and Olmesartan.

Colestipol and Olmesartan have a documented moderate interaction in FDA labeling.

FDA drug labeling documents a moderate-severity interaction between Colestipol and Olmesartan. Major interactions are generally avoided, moderate ones may need monitoring or a dose adjustment, and minor ones are usually low-risk. This page shows the documented mechanism and guidance. Label-documented interactions are not a complete safety review, so always confirm your own medications with a pharmacist or doctor. Educational information, not medical advice.

Drug A

Colestipol

Bile Acid Sequestrant

Drug B

Olmesartan

Angiotensin II Receptor Blocker (ARB)

How They Interact

Colestipol can bind to other drugs in your stomach and stop them from getting into your blood. This means you might not get the full benefit of your blood pressure treatment.

What To Do

Your doctor may advise you to take your blood pressure medication several hours before your dose of colestipol.

FDA Label Information

7 DRUG INTERACTIONS Lithium: Risk of lithium toxicity ( 7.2 ) Non-Steroidal Anti-Inflammatory Drugs (NSAIDs): Reduced diuretic, natriuretic and antihypotensive effects; increased risk of renal toxicity ( 7.3 ) Dual inhibition of the renin-angiotensin system: Increased risk of renal impairment, hypotension, and hyperkalemia ( 7.4 ) Colesevelam hydrochloride: Consider administering olmesartan at least 4 hours before colesevelam hydrochloride dose ( 7.5 ) Antidiabetic drugs: Dosage adjustment may be required ( 7.6 ) Cholestyramine and colestipol: Reduced absorption of thiazides ( 7.6 ) 7.1...

Frequently Asked Questions

Can I take Colestipol and Olmesartan together?

This is a moderate interaction. Your doctor may advise you to take your blood pressure medication several hours before your dose of colestipol.

How serious is the interaction between Colestipol and Olmesartan?

This interaction is classified as "moderate" severity by the FDA. Moderate interactions may worsen your condition or change how your medications work.

Why do Colestipol and Olmesartan interact?

Colestipol can bind to other drugs in your stomach and stop them from getting into your blood. This means you might not get the full benefit of your blood pressure treatment.

Understanding the Colestipol and Olmesartan Interaction

FDA-approved prescribing information for these two drugs flags their combination as a moderate-severity interaction. Colestipol belongs to the Bile Acid Sequestrant class and Olmesartan belongs to the Angiotensin II Receptor Blocker (ARB) class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Colestipol can bind to other drugs in your stomach and stop them from getting into your blood. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.

Context around a specific patient determines real-world impact. Colestipol has 24 total documented interactions on file in this dataset, and Olmesartan has 7. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Your doctor may advise you to take your blood pressure medication several hours before your dose of colestipol. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.

An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Colestipol or Olmesartan based on a web page, speak with your prescriber or pharmacist before making any change.

Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. Always consult your healthcare provider about drug interactions.