Last Updated: June 18, 2026

DARVON-N W Drug Patent Profile

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Which patents cover Darvon-n W, and when can generic versions of Darvon-n W launch?

Darvon-n W is a drug marketed by Aaipharma Llc and is included in two NDAs.

The generic ingredient in DARVON-N W is aspirin; propoxyphene napsylate. There are twenty-two drug master file entries for this compound. Additional details are available on the aspirin; propoxyphene napsylate profile page.

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Summary for DARVON-N W

US Patents:	0
Applicants:	1
NDAs:	2

US Patents and Regulatory Information for DARVON-N 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
Aaipharma Llc	DARVON-N W/ ASA	aspirin; propoxyphene napsylate	CAPSULE;ORAL	016829-001	Approved Prior to Jan 1, 1982		DISCN	No	No	⤷ Start Trial	⤷ Start Trial				⤷ Start Trial
Aaipharma Llc	DARVON-N W/ ASA	aspirin; propoxyphene napsylate	TABLET;ORAL	016863-001	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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