About Erectile Dysfunction Erectile Dysfunction is also known as Impotence and is defined as the inability to achieve or maintain a sufficient erection to perform a sexual intercourse.
In general term Impotence also means the inability to get an erection even after a male get sexually stimulated or to loose an erection prior to ejaculation.
There are two treatment options available for men to treat impotence; both of these would be effective.
About Viagra (Sildenafil Citrate) Viagra is the first anti-impotence or erectile dysfunction drug and was manufactured by Pfizer in 1998.
Viagra is blue colored, diamond shaped pill.
It contains key ingredient Sildenafil Citrate, a component that works by increasing blood flow to the penis while a male sexually stimulated.
The increased blood flow makes it easier to obtain and maintain an erection.
Viagra takes 20 minutes to an hour to get into effect and would be effective up to 4 hours.
Due to its long lasting proven records with very mild side effects it became familiar house hold name.
Viagra is also known as "Blue Pill".
About Cialis (Tadalafil) Cialis is the latest addition to the anti-impotence drugs manufactured by Lilly ICOS LLC.
It contains key ingredient Tadalafil, works by inhibiting an enzyme called PDE5 found primarily in the smooth muscle tissue of the penis' arterial walls and the lungs.
By inhibiting PDE5, Tadalafil helps in relaxing blood vessels of the penis and facilitates increased blood flow, which enables a prolonged erection.
After completion of sexual activity, erection disappears and the penis turns to flaccid state again.
Cialis takes 30 minutes to get into effect and would be effective up to 36 hours.
Due to its long lasting effect Cialis is also known as "La Weekend Pill".