Silagra is another generic form (the exact analogue) of Viagra. Silagra has the same efficiency as Viagra, however cheaper. Risk on the tablet Silagra allows you to split it into two parts and obtain instead of one tablet of 100 mg two dose of 50 mg, which is very convenient. Sildenafil is a substance which, not being a stimulating drug, well-established itself as an assistant to restore the normal erection men. Sildenafil effect on smooth muscles of the cavernous body of the penis, monitoring the presence of the nitric oxide in it. Due to the normal level of nitric oxide, the penis gets a chance to relax. As a consequence, the authority is able to take a quantity of blood sufficient to cause an erection. During the day Sildenafil completely eliminated from the body.