Erectile dysfunction(ED)

Erection: the ability of male sex organ to get the right shape for sexual intercourse (to erect), for appropriate time.

How it happens: when a male is sexually aroused blood flows into veins to the penis and nitric oxide is secreted , so smooth muscles in the walls of penis are stretched due to vasodilation.

Erectile dysfunction: is the partial or full loss of this ability.

Causes: either physical(especially veins) or psychological(usually depression)

Treatment: most commonly:

1-pills (Sildenafil, Taladafil,...)
                     
 2-surgical treatment.

Sildenafil: (Viagra™) is the most common treatment, it acts by inhibiting an enzyme called 

PD-5, so allowing much of nitric oxide leading to erection.

Cautions when using  Sildenafil:  1-if you are using nitrates (vasodilators).

                                                          2-  if having blood pressure disturbance.

It may also cause vision disturbance and skin rash.