When pharmacological methods fail, a purpose-designed external vacuum pump can be used to attain erection, with a separate compression ring fitted to the penis to maintain it. No known side effects are linked with this herb. The former uses the peripheral nerves and the lower parts of the spinal cord, whereas the latter uses the limbic system of the brain.
A vacuum device composed of a plastic cylinder, pump and elastic ring or band can be used to affect an erection. As can be understood from the mechanisms of a normal erection, impotence may develop due to hormonal deficiency, disorders of the neural system, lack of adequate penile blood supply or psychological problems. Restriction of blood flow can arise from impaired endothelial function due to the usual causes associated with coronary artery disease, but can also be caused by prolonged exposure to bright light. Duplex ultrasound is used to evaluate blood flow, venous leak, signs of atherosclerosis, and scarring or calcification of erectile tissue. It's important to realize that impotence may be a symptom of a more serious health problem, so if you're impotent, seek professional medical help immediately. In this case, the impotence lasts as long as you are taking the drugs.
The same goes for alcohol and narcotics, like heroin and cocaine.
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