Ezetimibe Drug Interactions: What to Avoid and What to Tell Your Doctor

One of ezetimibe's advantages over statins is its relatively clean drug interaction profile. Because ezetimibe doesn't significantly affect cytochrome P450 (CYP450) liver enzymes — the metabolic pathway responsible for most statin interactions — it avoids many of the interactions that complicate statin prescribing. However, there are a handful of clinically important interactions to know about.

Major Drug Interactions with Ezetimibe

Cyclosporine (Gengraf, Neoral, Sandimmune)

This is the most clinically significant interaction. Cyclosporine — an immunosuppressant used after organ transplants and for autoimmune conditions — increases ezetimibe blood levels by 2.3 to 12-fold. This dramatically increases the risk of ezetimibe-related adverse effects, particularly in patients with renal impairment.

If you take cyclosporine and your doctor is considering ezetimibe, this combination requires close monitoring of both cyclosporine levels and ezetimibe tolerability. The combination is classified as "avoid or use alternative" by most interaction databases.

Moderate Drug Interactions

Bile acid sequestrants (cholestyramine, colestipol, colesevelam)

2 hours before or 4 hours after the bile acid sequestrant. Do not take them at the same time.

Fibrates (other than fenofibrate)

Combining ezetimibe with fibrates other than fenofibrate (such as gemfibrozil) is not well-studied. Gemfibrozil slightly increases ezetimibe blood levels. More importantly, combining ezetimibe with any fibrate may increase the risk of gallstones (cholelithiasis). If you're taking ezetimibe with fenofibrate and develop abdominal pain, tell your doctor — gallbladder studies may be warranted.

Warfarin (Coumadin, Jantoven)

Post-marketing reports have described changes in INR (international normalized ratio, the measure of blood clotting) when ezetimibe is added to or removed from a warfarin regimen. If you take warfarin, your doctor should monitor your INR more closely when starting or stopping ezetimibe.

OATP1B1/1B3 inhibitors (glecaprevir/pibrentasvir, letermovir, enasidenib, others)

Ezetimibe is a substrate of the organic anion transporting polypeptides (OATP1B1 and OATP1B3), liver uptake transporters. Drugs that inhibit these transporters can significantly increase ezetimibe exposure. Notable examples include:

Glecaprevir/pibrentasvir (Mavyret): A hepatitis C treatment that increases ezetimibe exposure — use with caution and monitor.

Letermovir (Prevymis): An antiviral used after bone marrow transplants that can raise ezetimibe levels.

Enasidenib (Idhifa): A leukemia treatment classified as "avoid or use alternative" when combined with ezetimibe due to OATP inhibition.

What About Ezetimibe + Statins?

Taking ezetimibe with a statin is one of the most common prescribing patterns, and the combination is generally safe. There are no pharmacokinetic interactions between ezetimibe and most statins at the level of CYP450 enzymes. However, some additive risks should be noted:

Liver enzyme elevations may be slightly more common when ezetimibe is combined with a statin than with either drug alone.

Myopathy risk from the statin component remains — particularly with higher statin doses and in older patients.

Any statin's own drug interactions remain relevant — for example, simvastatin's interactions with CYP3A4 inhibitors like grapefruit juice, itraconazole, or certain HIV medications.

Food Interactions: Does Ezetimibe Interact with Grapefruit?

No. Ezetimibe does not interact with grapefruit juice. This is in contrast to some statins (particularly simvastatin and lovastatin) which are significantly affected by grapefruit. Ezetimibe can be taken with or without food, including high-fat meals, without meaningful changes in drug effect.

What to Tell Your Doctor and Pharmacist

Before starting ezetimibe, make sure your prescriber knows about all medications you take, including:

Immunosuppressants, especially cyclosporine

Cholesterol-lowering medications, especially bile acid sequestrants and fibrates

Anticoagulants, especially warfarin

Antivirals (hepatitis C drugs, antiretrovirals, CMV prophylaxis)

Any cancer treatments

Also see: Ezetimibe side effects: what to expect and when to call your doctor.

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