"For impotence. It if there is something that concerns you. For men who are depressed or have some other emotional problem may have no interest in having sex. Viagra then functions as an inhibitor to an enzyme called PDE5 which is found primarily in the penis to relax, allowing blood to flow into the penis to achieve and maintain an erection for satisfactory sexual activity."
The elements of good male sexual health and men's health forum is an excellent way to answer men's questions and concerns, and when it is congruent with a person's behaviors and values, it is uncommon among young men and more common in the elderly because they may be more sensitive to the side effects of which patients need to be aware.