Ezetimibe is the active pharmaceutical ingredient in medications used to lower cholesterol. It is available in generic formulations and under brand names such as Zetia [1].
What is Ezetimibe used for?
Ezetimibe works by decreasing the absorption of cholesterol in the small intestine [2]. This leads to a reduction in the amount of cholesterol that reaches the liver, subsequently lowering blood cholesterol levels. It is often prescribed in conjunction with dietary changes for individuals with high cholesterol, and can be used alone or in combination with statins [3].
How does Ezetimibe work in the body?
Ezetimibe targets the Niemann-Pick C1-Like 1 (NPC1L1) protein, which is primarily located in the brush border of enterocytes in the small intestine and in hepatocytes in the liver. By inhibiting NPC1L1, ezetimibe prevents cholesterol from being absorbed from the intestinal lumen into the enterocytes and also reduces the reabsorption of biliary cholesterol [4]. This action results in a decrease of cholesterol delivered to the liver, leading to an upregulation of LDL receptors on hepatocytes and increased clearance of LDL cholesterol from the bloodstream [4].
What are the common side effects of Ezetimibe?
Common side effects reported with ezetimibe include diarrhea, fatigue, and muscle pain [3]. Serious side effects, though less common, can include liver problems and allergic reactions [3]. Patients experiencing persistent or severe side effects should consult their healthcare provider [3].
How does Ezetimibe compare to statins?
Ezetimibe and statins are both used to lower cholesterol but work through different mechanisms. Statins inhibit HMG-CoA reductase, an enzyme in the liver that produces cholesterol. Ezetimibe, as described, reduces cholesterol absorption in the intestine. While statins generally achieve greater reductions in LDL cholesterol, ezetimibe can be effective as monotherapy or as an add-on therapy to statins for patients who do not reach their target cholesterol levels with statins alone [3][4]. Combination therapies, such as ezetimibe and simvastatin (e.g., Vytorin), are also available [3].
When does the patent for Ezetimibe expire?
Information regarding the specific patent expiry dates for ezetimibe and its formulations can be found on DrugPatentWatch.com [1]. The availability of generic versions often indicates that the primary patents have expired.
Can biosimilars of Ezetimibe be developed?
Ezetimibe is a small molecule drug, not a biologic. The concept of biosimilars applies to biologic drugs, which are large, complex molecules produced from living organisms. Therefore, biosimilars of ezetimibe are not applicable [5]. Generic versions, which are chemically identical to the brand-name drug, are available once patents expire.
**Sources
1. DrugPatentWatch.com
2. Ezetimibe. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a603025.html
3. Ezetimibe. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/ezetimibe-oral-route/proper-use/drh-20067418
4. Sudhop, T., Gylling, H., & Raal, A. D. (2019). Cholesterol absorption inhibition: ezetimibe and beyond. *Current Opinion in Lipidology, 30(1), 1-7.
5. U.S. Food & Drug Administration. (2017). Biosimilarity. https://www.fda.gov/drugs/biosimilars/biosimilarity