Last Updated: November 9, 2026

ELCYS Drug Patent Profile

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Which patents cover Elcys, and when can generic versions of Elcys launch?

Elcys is a drug marketed by Exela Pharma and is included in one NDA. There are sixteen patents protecting this drug and one Paragraph IV challenge.

The generic ingredient in ELCYS is cysteine hydrochloride. There is one drug master file entry for this compound. Two suppliers are listed for this compound. Additional details are available on the cysteine hydrochloride profile page.

DrugPatentWatch® Generic Entry Outlook for Elcys

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be January 15, 2039. This may change due to patent challenges or generic licensing.

There have been five patent litigation cases involving the patents protecting this drug, indicating strong interest in generic launch. Recent data indicate that 63% of patent challenges are decided in favor of the generic patent challenger and that 54% of successful patent challengers promptly launch generic drugs.

There is one tentative approval for the generic drug (cysteine hydrochloride), which indicates the potential for near-term generic launch.

Indicators of Generic Entry

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DrugPatentWatch® Estimated Loss of Exclusivity (LOE) Date for ELCYS
Generic Entry Date for ELCYS*:
Constraining patent/regulatory exclusivity:
NDA:
Dosage:

SOLUTION;INTRAVENOUS

*The generic entry opportunity date is the latter of the last compound-claiming patent and the last regulatory exclusivity protection. Many factors can influence early or later generic entry. This date is provided as a rough estimate of generic entry potential and should not be used as an independent source.

Paragraph IV (Patent) Challenges for ELCYS
Tradename Dosage Ingredient Strength NDA ANDAs Submitted Submissiondate
ELCYS Injection cysteine hydrochloride 500 mg/10 mL 210660 1 2019-12-10

US Patents and Regulatory Information for ELCYS

ELCYS is protected by sixteen US patents.

Based on analysis by DrugPatentWatch, the earliest date for a generic version of ELCYS is ⤷  Start Trial.

This potential generic entry date is based on patent 10,653,719.

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 11,510,942 ⤷  Start Trial Y ⤷  Start Trial
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 10,905,713 ⤷  Start Trial Y ⤷  Start Trial
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 10,583,155 ⤷  Start Trial Y ⤷  Start Trial
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 11,679,125 ⤷  Start Trial Y ⤷  Start Trial
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 10,905,714 ⤷  Start Trial Y ⤷  Start Trial
Exela Pharma ELCYS cysteine hydrochloride SOLUTION;INTRAVENOUS 210660-001 Apr 16, 2019 RX Yes Yes 11,510,941 ⤷  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

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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.