Venlafaxine HCl (Effexor ER) 37.5, 75 and 150 mg Capsules: Innovator sued Zydus Cadilla for filing Paragraph IV

Innovator Wyeth has sued generic competitor Zydus Cadilla for filing ANDA no. 90-174 with Paragraph IV certification against Orange Book listed patents of Wyeth's anti-depression drug Effexor ER Capsules 37.5, 75 and 150 mg (venlafaxine HCl).

Following patents are listed in Orange Book w.r.t Venlafexine XR capsules:

US6274171 (Expiry: September 20, 2017): Link
US6403120 (Expiry: September 20, 2017) link
US6419958 (Expiry: September 20, 2017) Link
US4535186 (Expiry: June 13, 2008) Link
US5916923 (Expiry: December 28, 2013) Link
US6444708 (Expiry: December 28, 2013) Link

Innovator has sued Zydus Cadilla for the infringement of ‘171, ‘120 and ‘958 patents in the US District Court for the District of Delaware.

Following generic players are in litigation with innovator:

Anchen Pharmaceuticals

Lupin

Sandoz

Mylan

Wockhardt

Biovail

Apotex

Also, innovator has settled with generic players like Impax , Sun pharma and Teva on this product.
Earlier news of pharmadoc Here