Viagra
Viagra works by increasing the blood flow to the penis which provides for a stable erection. The greater the blood flow to the penis - the greater the degree of the erection. Some 11 years ago three scientists made a breakthrough discovery that completely changed lives of millions of men – they demonstrated that nitric oxide acts as a signaling device between human cardiovascular cells and participates in the process of erection; for their contribution the scientists received a Nobel Prize in Physiology and Medicine.
The effects of Viagra are based on its active compound known as sildenafil citrate. Viagra first became available in 1998 and has been competing with two other drugs containing similar active compounds – tadalafil and vardenafil – ever since. Viagra works in the following way: nitric oxide is released into corpus cavernosum of the penis increasing the levels of cGMP (cyclic guanosine monophosphate) that smoothes and relaxes muscle tissues leading to the blood inflow and erection. Sildenafil citrate inhibits phosphodiestrase type 5 (PDE5), which is an enzyme regulating blood flow to the penis responsible for breaking down cGMP, therefore preventing a man from having a full erection. As a result the man achieves a stable erection that lasts for several (3-5) hours.
Our online pharmacy offers a wide range of medications. Please have a look at the options for Viagra below and proceed to our main website to place an order.
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