Erection of the penis occurs when it is filled with blood. This happens because the blood vessels which bring the blood into the penis enlarge during erection. It is recommended that impotence drugs should not be taken in case of Peyronie’s disease (when the penis is in a curved position) and priapism (when the individual has prolonged painful erections).

Viagra Sildenafil

Another popular drug used for the treatment of erectile dysfunction is sildenafil, which is sold under the brand name Viagra. It is the first drug to be launched for the treatment of impotence and is still quite popular.

Cialis Tadalafil

This oral drug is used to treat erectile dysfunction. Cialis increases the blood flow to the penis. It belongs to the class of medications known as phosphodiesterase inhibitors and it can be used only on a valid prescription.

Levitra Vardenafil

This drug is marketed under the trade name Levitra. An individual, who suffers from erectile dysfunction, can consume 10mg of Levitra, 60 minutes prior to anticipated sexual activity.

Viagra, Levitra and Cialis work by helping to increase the blood flow to the penis, when a person is sexually stimulated. This helps you to maintain an erection for a longer period of time. Though, it is taken by people all around the world, it is advised, that you consult a doctor before you take any of these drugs. Men suffering from penis conditions such as Peyronie’s disease and priapism should avoid impotence drugs because it may lead to severe pain and complications. If you have any of these two conditions, your doctor may recommend dose adjustments or special tests before recommending these medications.