Last Updated: August 3, 2026

OGEN Drug Patent Profile

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

Ogen is a drug marketed by Pharmacia And Upjohn and Pfizer and is included in two NDAs.

The generic ingredient in OGEN is estropipate. There are two drug master file entries for this compound. Additional details are available on the estropipate profile page.

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Summary for OGEN

US Patents:	0
Applicants:	2
NDAs:	2

US Patents and Regulatory Information for OGEN

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Glossary

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Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Pharmacia And Upjohn	OGEN	estropipate	CREAM;VAGINAL	084710-001	Approved Prior to Jan 1, 1982		DISCN	No	No	⤷ Start Trial	⤷ Start Trial				⤷ Start Trial
Pfizer	OGEN 2.5	estropipate	TABLET;ORAL	083220-003	Approved Prior to Jan 1, 1982		DISCN	Yes	No	⤷ Start Trial	⤷ Start Trial				⤷ Start Trial
Pfizer	OGEN .625	estropipate	TABLET;ORAL	083220-001	Approved Prior to Jan 1, 1982		DISCN	Yes	No	⤷ Start Trial	⤷ 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

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