Bayer Schering and Bayer Healthcare together with Schering have filed a patent infringement lawsuit against Teva Pharmaceuticals over Teva’s application for approval to market Levitra for the treatment of erectile dysfunction.

The lawsuit was filed in the US Federal Court in the District of Delaware against Teva Pharmaceuticals and Teva Pharmaceutical Industries.

The patent at issue in the suit is Bayer Schering Pharma‘s US Patent No 6362178 which is only set to expire in 2018. Levitra is marketed by Schering-Plough and GlaxoSmithKline in the US.

Bayer Schering is a speciality pharmaceutical company focused on diagnostic imaging, general medicine, speciality medicine and women’s healthcare.