Viagra (Sildenafil)
is approved for the treatment of men who have difficulty
having and maintaining an erection (impotence).
Sildenafil Citrate is the active chemical in Viagra that
relaxes muscles in the penis therefore improving blood
flow.
Levitra (Vardenafil
HCI) helps increase blood flow to the penis and may help
men with ED (Erectile Dysfunction) get and keep an
erection satisfactory for sexual activity.
Cialis is a
prescription medicine taken by mouth for the treatment
of erectile dysfunction (ED) in men. CIALIS helps
increase blood flow to the penis and may help men with
ED get and keep an erection satisfactory for sexual
activity.