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Sildenafil is a selective inhibitor of cyclic guanosine monophosphate-specific phosphodiesterase type 5 that is used to treat erectile dysfunction. Phosphodiesterase type 5 is an enzyme which breaks down the cyclic guanosine monophosphate, a natural activator that is responsible for relaxation and widening of the blood vessels. Sildenafil blocks this enzyme and promotes a releasing of nitric oxide in the cavernous body during sexual stimulation. Thus it helps to achieve and maintain an erection sufficient for satisfactory sexual intercourse. And to feel its effectiveness it is necessary to have the sexual stimulation. It is used as a common treatment for male sexual function problems such as impotence or erectile dysfunction. It is recommended to use it as prescribed to avoid side effects such as a headache, heartburn, flushed skin, sudden-onset hearing loss, and prolonged erections, the last can lead to damage to the penis. The use of sildenafil is contraindicated in patients with cardiovascular disorders and kidney diseases. As it can inhibit phosphodiesterase type 5 also in the lungs it is used as a treatment for pulmonary arterial hypertension. You can buy Sildenafil online on our website and we guarantee fast shipping to USA or UK and cheap prices.