Pfizer has settled its litigation against Teva Pharmaceuticals USA Inc., relating to Pfizer’s patent covering the use of Pfizer's Viagra (sildenafil citrate) to treat erectile dysfunction in 25-, 50-, and 100-mg tablets. The patent expires in April 2020, including pediatric exclusivity. As a result of the settlement, Teva will be allowed to launch a generic version of Viagra under a royalty-bearing license on Dec. 11, 2017, in the United States on December 11, 2017, or earlier under certain circumstances. Teva will pay Pfizer a royalty for a license to produce its generic version. The terms of the settlement agreement are otherwise confidential. Teva has received tentative approval from FDA for its generic version of Viagra.
Sources: Pfizer and Teva Pharmaceuticals