Entecavir Patent Evaluation, Method for Diastereomeric Impurities

Krishna Sarma Pathy
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Krishna Sarma Pathy: Head –QC,QA/R&D-IPL Research Centre Lucknow, India

Organic & Medicinal Chemistry International Journal, 2018, vol. 7, issue 3, 83-96

Abstract: Entecavir is an oral antiviral drug used in the treatment of hepatitis B infection. Entecavir is a guanosine nucleoside analogue with selective activity against hepatitis B virus (HBV), which inhibits reverse transcription, The initial patent on entecavir expired in South Africa in 2011 ZA 1991/07894. Current status available on: http://patentsearch.cipc.co.za/, which should have permitted lower-cost generic competitors to enter the market. However, South Africa granted BMS three additional patents on entecavir that only expire between 2022 and 2026. Two of these patents have lapsed-meaning BMS has not paid the renewal fees, and they cannot be enforced-while one patent covering a lower dosage form of entecavir remains in force.

Keywords: juniper publishers:Medicinal Chemistry; Biochemistry Journal; Pharmacology Journal; biochemical pharmacology; molecular pharmacology; biochemistry; open access journals; peer reviewed journals; Open Access; Journal of Molecular Biochemistry; International Research Journal of Pure and Applied Chemistry; World Journal of Biological Chemistry; Biochemistry and Analytical Biochemistry; Biochemistry & Physiology: Open Access; Molecular Biology International; Plant Biochemistry & Physiology; International Journal of Molecular Sciences; Journal of Clinical and Medical Genomics; Environmental Analytical Chemistry; Medicinal Chemistry; Juniper publishers reivews (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:adp:jomcij:v:7:y:2018:i:3:p:83-96

DOI: 10.19080/OMCIJ.2018.07.555711

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