Last Updated: May 4, 2026

PRINCIPEN W Drug Patent Profile

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When do Principen W patents expire, and when can generic versions of Principen W launch?

Principen W is a drug marketed by Apothecon and is included in two NDAs.

The generic ingredient in PRINCIPEN W is ampicillin/ampicillin trihydrate; probenecid. Additional details are available on the ampicillin/ampicillin trihydrate; probenecid profile page.

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Summary for PRINCIPEN W

US Patents:	0
Applicants:	1
NDAs:	2

US Patents and Regulatory Information for PRINCIPEN W

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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
Apothecon	PRINCIPEN W/ PROBENECID	ampicillin/ampicillin trihydrate; probenecid	CAPSULE;ORAL	062150-001	Approved Prior to Jan 1, 1982		DISCN	No	No	⤷ Start Trial	⤷ Start Trial				⤷ Start Trial
Apothecon	PRINCIPEN W/ PROBENECID	ampicillin/ampicillin trihydrate; probenecid	CAPSULE;ORAL	050488-001	Approved Prior to Jan 1, 1982		DISCN	No	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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