Last Updated: November 13, 2026

Eisai Inc Company Profile

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What is the competitive landscape for EISAI INC

EISAI INC has eleven approved drugs.

There are sixteen US patents protecting EISAI INC drugs.

Summary for Eisai Inc
US Patents:16
Tradenames:8
Ingredients:7
NDAs:11

Drugs and US Patents for Eisai Inc

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Eisai Inc HALAVEN eribulin mesylate SOLUTION;INTRAVENOUS 201532-001 Nov 15, 2010 AP RX Yes Yes ⤷  Start Trial ⤷  Start Trial
Eisai Inc DAYVIGO lemborexant TABLET;ORAL 212028-002 Apr 7, 2020 RX Yes Yes ⤷  Start Trial ⤷  Start Trial
Eisai Inc BANZEL rufinamide SUSPENSION;ORAL 201367-001 Mar 3, 2011 AB RX Yes Yes ⤷  Start Trial ⤷  Start Trial
Eisai Inc LENVIMA lenvatinib mesylate CAPSULE;ORAL 206947-002 Feb 13, 2015 RX Yes Yes ⤷  Start Trial ⤷  Start Trial
Eisai Inc LENVIMA lenvatinib mesylate CAPSULE;ORAL 206947-002 Feb 13, 2015 RX Yes Yes 10,407,393*PED ⤷  Start Trial Y ⤷  Start Trial
Eisai Inc LENVIMA lenvatinib mesylate CAPSULE;ORAL 206947-001 Feb 13, 2015 RX Yes No 12,083,112*PED ⤷  Start Trial Y ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

Expired US Patents for Eisai Inc

Applicant Tradename Generic Name Dosage NDA Approval Date Patent No. Patent Expiration
Eisai Inc ARICEPT donepezil hydrochloride TABLET;ORAL 020690-001 Nov 25, 1996 5,985,864 ⤷  Start Trial
Eisai Inc ARICEPT donepezil hydrochloride TABLET;ORAL 020690-001 Nov 25, 1996 6,245,911 ⤷  Start Trial
Eisai Inc ARICEPT donepezil hydrochloride TABLET;ORAL 020690-002 Nov 25, 1996 5,985,864 ⤷  Start Trial
Eisai Inc HALAVEN eribulin mesylate SOLUTION;INTRAVENOUS 201532-001 Nov 15, 2010 6,469,182 ⤷  Start Trial
Eisai Inc ARICEPT donepezil hydrochloride TABLET;ORAL 020690-001 Nov 25, 1996 4,895,841 ⤷  Start Trial
Eisai Inc ARICEPT ODT donepezil hydrochloride TABLET, ORALLY DISINTEGRATING;ORAL 021720-002 Oct 18, 2004 7,727,548 ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >Patent No. >Patent Expiration
Paragraph IV (Patent) Challenges for EISAI INC drugs
Drugname Dosage Strength Tradename Submissiondate
➤ Subscribe Tablets 100 mg, 200 mg and 400 mg ➤ Subscribe 2012-11-14
➤ Subscribe Orally Disintegrating Tablets 5 mg and 10 mg ➤ Subscribe 2010-06-30
➤ Subscribe Tablets 23 mg ➤ Subscribe 2013-07-09
➤ Subscribe Oral Suspension 40 mg/mL ➤ Subscribe 2014-06-16
➤ Subscribe Capsules 4 mg and 10 mg ➤ Subscribe 2019-02-13

Supplementary Protection Certificates for Eisai Inc Drugs

Patent Number Supplementary Protection Certificate SPC Country SPC Expiration SPC Description
1415987 SPC/GB15/063 United Kingdom ⤷  Start Trial PRODUCT NAME: LENVATINIB, OPTIONALLY IN THE FORM OF A PHARMACEUTICALLY ACCEPTABLE SALT OR A HYDRATE THEREOF; REGISTERED: UK EU/1/15/1002/001-002 20150601
1087960 C201100037 Spain ⤷  Start Trial PRODUCT NAME: ERIBULINA; NATIONAL AUTHORISATION NUMBER: EU/1/11/678/001-002; DATE OF AUTHORISATION: 20110317; NUMBER OF FIRST AUTHORISATION IN EUROPEAN ECONOMIC AREA (EEA): EU/1/11/678/001-002; DATE OF FIRST AUTHORISATION IN EEA: 20110317
1087960 2011C/028 Belgium ⤷  Start Trial PRODUCT NAME: ERIBULIN; AUTHORISATION NUMBER AND DATE: EU/1/11/678/001 20110317
1415987 57/2015 Austria ⤷  Start Trial PRODUCT NAME: LENVATINIB ODER EIN PHARMAZEUTISCH ANNEHMBARES SALZ DAVON ODER EIN HYDRAT DAVON; REGISTRATION NO/DATE: EU/1/15/1002/001-002 (MITTEILUNG) 20150601
1415987 15C0070 France ⤷  Start Trial PRODUCT NAME: LENVATINIB OU UN SEL PHARMACEUTIQUEMENT ACCEPTABLE DE CELUI-CI OU UN HYDRATE DE CELUI-CI; REGISTRATION NO/DATE: EU/1/15/1002 20150601
1415987 92858 Luxembourg ⤷  Start Trial PRODUCT NAME: LENVATINIB, OU UN DE SES SELS PHARMACEUTIQUEMENT ACCEPTABLES OU UN HYDRATE DE CELUI-CI
>Patent Number >Supplementary Protection Certificate >SPC Country >SPC Expiration >SPC Description
Similar Applicant Names
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Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. We do not provide individual investment advice. This service is not registered with any financial regulatory agency. The information we publish is educational only and based on our opinions plus our models. By using DrugPatentWatch you acknowledge that we do not provide personalized recommendations or advice. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.