Last Updated: August 25, 2026

tasimelteon - Profile


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What are the generic sources for tasimelteon and what is the scope of patent protection?

Tasimelteon is the generic ingredient in three branded drugs marketed by Vanda Pharms Inc, Apotex, MSN, and Teva Pharms Usa Inc, and is included in five NDAs. There are thirty-three patents protecting this compound and two Paragraph IV challenges. Additional information is available in the individual branded drug profile pages.

Tasimelteon has two hundred and seventeen patent family members in twenty-four countries.

Summary for tasimelteon
International Patents:217
US Patents:33
Tradenames:3
Applicants:4
NDAs:5
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for tasimelteon
Paragraph IV (Patent) Challenges for TASIMELTEON
Tradename Dosage Ingredient Strength NDA ANDAs Submitted Submissiondate
HETLIOZ LQ Oral Suspension tasimelteon 4 mg/mL 214517 1 2024-04-01
HETLIOZ Capsules tasimelteon 20 mg 205677 3 2018-01-31

US Patents and Regulatory Information for tasimelteon

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes 9,539,234 ⤷  Start Trial ⤷  Start Trial
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes 9,855,241 ⤷  Start Trial ⤷  Start Trial
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes RE46604 ⤷  Start Trial ⤷  Start Trial
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes 10,149,829 ⤷  Start Trial ⤷  Start Trial
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes 9,730,910 ⤷  Start Trial ⤷  Start Trial
Vanda Pharms Inc HETLIOZ tasimelteon CAPSULE;ORAL 205677-001 Jan 31, 2014 AB RX Yes Yes 9,060,995 ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

EU/EMA Drug Approvals for tasimelteon

Company Drugname Inn Product Number / Indication Status Generic Biosimilar Orphan Marketing Authorisation Marketing Refusal
Vanda Pharmaceuticals Netherlands B.V. Hetlioz tasimelteon EMEA/H/C/003870Hetlioz is indicated for the treatment of Non-24-Hour Sleep-Wake Disorder (Non-24) in totally blind adults., Authorised no no yes 2015-07-03
>Company >Drugname >Inn >Product Number / Indication >Status >Generic >Biosimilar >Orphan >Marketing Authorisation >Marketing Refusal

International Patents for tasimelteon

Country Patent Number Title Estimated Expiration
European Patent Office 3105212 TASIMELTÉON DE QUALITÉ PHARMACEUTIQUE, HAUTEMENT PURIFIÉ (HIGHLY PURIFIED PHARMACEUTICAL GRADE TASIMELTEON) ⤷  Start Trial
European Patent Office 3470405 TASIMELTEON DE QUALITÉ PHARMACEUTIQUE HAUTEMENT PURIFIÉE (HIGHLY PURIFIED PHARMACEUTICAL GRADE TASIMELTEON) ⤷  Start Trial
European Patent Office 4223747 TASIMELTEON DE QUALITÉ PHARMACEUTIQUE HAUTEMENT PURIFIÉ (HIGHLY PURIFIED PHARMACEUTICAL GRADE TASIMELTEON) ⤷  Start Trial
Japan 2017506642 高純度医薬品等級タシメルテオン ⤷  Start Trial
Japan 2020079248 高純度医薬品等級タシメルテオン (HIGHLY PURIFIED PHARMACEUTICAL GRADE TASIMELTEON) ⤷  Start Trial
Japan 2022088624 高純度医薬品等級タシメルテオン ⤷  Start Trial
>Country >Patent Number >Title >Estimated Expiration

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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.