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Fildena 100 (Sildenafil Citrate), Sold as the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. Sildenafil acts by blocking phosphodiesterase 5 (PDE5), an enzyme that promotes the breakdown of cGMP, which regulates blood flow in the p e n i s. It requires s e x u a l arousal, however, to work. It also results in the spread of the blood vessels in the lungs. If you want to get more detail about ED and men impotence then have a peek here: EDBalance