Pfizer famous drug for erectile dysfunction Viagra patent expires by 2020! Teva will be allowed to market the generic version of Viagra by 2017. this process is on its way to get approved by US FDA. Teva in exchange will be paying royalty to Pfizer.

It seems to be a great deal for both companies! Pfizer on one hand will get royalty along with the sales of its brand product whereas Teva will enjoy its monopoly of low rate generic version of Viagra and secure its position in market way in advance of its other generic competitors!