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How does an erection normally occur? The neurotransmitters which are released in the penis cause another chemical to be made called cyclic guanosine monophosphate (cGMP). An increase of cGMP causes the arteries in the penis to dilate (widen). This allows extra blood to flood into the penis. The rapid inflow of blood causes the penis to swell into an erection. The swollen inner part of the penis also presses on the veins nearer to the skin surface of the penis. These veins normally drain the penis of blood. So, the flow of blood out of the penis is also restricted, which enhances the erection. This section needs additional citations for verification. (May 2010) Erectile Dysfunction At A Glance: Erectile dysfunction is common; experts have estimated that erectile dysfunction affects 30 million men in the Untied States. viagra online best price viagra Is the patient taking medications that can contribute to erectile dysfunction? Direct vibrational stimulation (biothesiometry) is occasionally done to evaluate penile nerve function. Small electromagnetic electrodes are placed on the shaft of the penis and vibration amplitude is slightly adjusted until sensation is noted by the patient. Although this test does not measure the exact nerve function, it serves as a screening method to detect any sensory nerve deficit as the cause of ED. How Common Is Erectile Dysfunction? A much more common problem that affects the majority of men at some point in their life is the occasional failure to achieve an erection, which can occur for a variety of reasons, such as from drinking too much alcohol or from being extremely tired. buy viagra online without prescription buying viagra online in britain buy viagra Lifestyle and other advice - As mentioned above, ED is often a marker that heart disease or other cardiovascular diseases may soon develop. Therefore, you should review your lifestyle to see if any changes can be made to minimise the risk of developing these problems. For example, stop smoking if you are a smoker, take regular exercise, eat a healthy diet, etc. Also, your doctor may prescribe a statin drug to lower your blood cholesterol level if your risk of developing cardiovascular disease is high. orignal viagra online uk buy viagra