![Prazdroj](https://www.prazdroj.cz/cospospohzeg/themes/prazdroj/img/logo-sm.png?bf6476bc)
czen
OLYMPUS DIGITAL CAMERA
Since the patent for sildenafil expired in 2013, there are currently a large number of inexpensive Viagra substitutes on the market, information about which can be found here , one of which is from Pfizer itself. As an alternative for the treatment of impotenci, three other active ingredients from the group of selective PDE5 inhibitors can be used.