ezetimibe
Ezetimibe (Zetia) is an oral medicine that lowers cholesterol by blocking its absorption in the small intestine. It is used alone or with other cholesterol-lowering medicines such as statins to reduce LDL ("bad") cholesterol in adults and children with inherited or acquired high cholesterol.
This page is based on MedlinePlus patient information for ezetimibe, cross-checked with the National Cancer Institute drug dictionary; the mechanism is explained in plain language, and analogies are used only where they stay accurate.
How it works
Explains what the medicine does in the body, not dosing, side effects, or safety.
An analogy
The intestine is like a loading dock where cholesterol from food enters the body. Ezetimibe closes the gate at that dock, so less dietary cholesterol gets through into the bloodstream, and the liver pulls more LDL out of the blood to make up for the shortfall.
In simple terms
Ezetimibe works at the wall of the small intestine, where it blocks a transporter protein that normally absorbs cholesterol from food and bile. By reducing the amount of cholesterol that enters the body from the intestine, ezetimibe lowers the liver's cholesterol stores. The liver then pulls more LDL cholesterol out of the bloodstream to replace what it lost, which lowers the amount of LDL ("bad" cholesterol) circulating in the blood. Ezetimibe can be used alone or together with statins or other cholesterol medicines. It does not replace a healthy diet and lifestyle.
In depth
Ezetimibe is an azetidinone derivative that selectively inhibits the absorption of cholesterol and related phytosterols at the brush border of the small intestine. The drug appears to interact physically with the sterol transporter NPC1L1 (Niemann-Pick C1-Like 1), blocking uptake of dietary and biliary cholesterol into enterocytes. Reduced intestinal cholesterol delivery decreases hepatic cholesterol stores, which upregulates LDL receptor expression on hepatocytes and increases clearance of LDL particles from the circulation. The overall effect is a reduction in total cholesterol, LDL cholesterol, apolipoprotein B, and triglycerides, with a modest increase in HDL cholesterol. Ezetimibe is indicated for homozygous and heterozygous familial hypercholesterolemia, primary hyperlipidemia, and homozygous familial sitosterolemia.
See it in motion
A schematic animation of the mechanism — simplified for clarity, not drawn to scale.
How ezetimibe blocks the cholesterol gate at the small intestine
- The intestine is like a loading dock where cholesterol from food enters the body.
- Ezetimibe works at the wall of the small intestine, where it blocks a transporter protein that normally absorbs cholesterol from food and bile.
- Ezetimibe closes the gate at that dock, so less dietary cholesterol gets through into the bloodstream, and the liver pulls more LDL out of the blood to make up for the shortfall.
- By reducing the amount of cholesterol that enters the body from the intestine, ezetimibe lowers the liver's cholesterol stores.
Target: Niemann-Pick C1-Like 1 (NPC1L1)
A sterol transporter at the brush border of the small intestine that mediates uptake of dietary cholesterol and plant sterols; ezetimibe blocks NPC1L1 to reduce intestinal cholesterol absorption.
Approved uses
Approved uses differ by country and change over time. Always follow your local prescribing information.
Approved uses in United States
MedlinePlus- Used along with diet, alone or in combination with statins, to reduce low-density lipoprotein (LDL) cholesterol in adults and children 10 years of age or older with familial heterozygous hypercholesterolemia.
- Used along with diet, alone or in combination with statins or fenofibrate, in adults with elevated blood fats.
- Used with other medications to reduce LDL cholesterol in adults and children 10 years of age or older with homozygous familial hypercholesterolemia.
- Used to reduce other fatty substances in the blood in adults and children 9 years of age or older with homozygous familial sitosterolemia.
Official sources
The statements on this page trace back to these records.
- MedlinePlus: ezetimibe
MedlinePlus, U.S. National Library of Medicine
- National Cancer Institute: ezetimibe
National Cancer Institute
This page explains how the medicine works — it isn’t the patient leaflet. For anything that applies to you, read the leaflet that came with your medicine or ask your pharmacist.
MedUnfold provides educational content and is not medical advice. Always follow your local prescribing information and healthcare professional.