The scientific name of Virecta is sildenafil, and it works to inhibit the enzyme phosphodiesterase-5 in the cavernous body of the penis. This results in the expansion of blood vessels and increased blood flow in the cavernous body, resulting in penis erection upon sexual stimulation, as well as inhibiting the enzyme phosphodiesterase-5 in the smooth muscles, which It causes the relaxation and widening of the pulmonary vessels to treat arterial hypertension.