Sildenafil is a selective inhibitor of cGMP-specific phosphodiesterase (PDE-5). Penile erection involves relaxation of the corpus cavernosum, an event mediated by NO and cGMP.
Sildenafil is a medicine used to treat erectile dysfunction. It increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it.
Common side effects are
headaches.
feeling sick.
hot flushes, including facial flushing.
indigestion.
a colour tinge to your vision or blurred vision.
stuffy nose.
dizziness.
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