In the late 1960s it was thought that erectile dysfunction was of psychogenic origin, with the new knowledge, nowadays we know that up to 15% of erectile dysfunctions are of neurological origin, neurogenic erectile dysfunction is when a neuropathic process , Either central or peripheral leads to failure in the onset or maintenance of the erection or is the persistent inability to achieve and maintain a penile erection sufficient to have a satisfactory sexual performance, this condition have suffered millions of men in The world, this pathology is associated with men suffering from hypertension, diabetes, cardiovascular disease, increased cholesterol, liver and kidney failure, depression and psychotic disorders.
In 1998, a product that initiates a long revolution in sexuality in the world, is a drug that is indicated for the treatment of erectile dysfunction, Pfizer was the first manufacturer of this drug, under the name of Viagra, With its active component, sildenafil, all started originally for the treatment of angina, a heart problem that affects the blood vessels that carry blood to the heart.

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Pharmaceutical company Pfizer was actually looking for a drug that would allow them to relax, but the tests did not yield positive results.
Pfizer was about to give up testing when volunteers who underwent these began reporting an unusual side effect, many erections.

Chris Wayman, one of the company’s scientists, was in charge of investigating what happened, Wayman created a model man in the laboratory, a series of test tubes, placed inert substances and the tissue of the penis of an impotent man.
Each piece of tissue was connected to a box that, triggered by a switch, sent an electric pulse, the first time he did this nothing happened, but once he added Viagra to the specimens containing the tissues, the blood vessels in these As with a man when he has an erection, Sildenafil is part of the phosphodiesterase 5 (PDE5A) inhibitor group, which acts as a peripheral vasodilator, meaning that Sildenafil causes an increase in the flow of Blood in certain areas of the body, including the penis, increased blood flow in this area of the body can overcome erectile dysfunction, increased blood flow by consumption of Sildenafil also occurs at the level of the pulmonary vascular system, for this reason , This medicine is also indicated to relax the smooth muscles of this area

Viagra side effects
Because its vasodilatory properties cause a slight decrease in blood pressure, Viagra should be used sparingly by people with cardiovascular disease, and its consumption should be prohibited to hypotensive patients and those receiving a treatment based on nitrate derivatives, For these reasons, it is essential to perform an analysis of cardiovascular function before starting treatment with this medication, if this evaluation is not performed, people with a certain cardiac risk could suffer a myocardial infarction, ventricular arrhythmia or cerebrovascular hemorrhages, another important recommendation Is to interrupt the use of Sildenafil in case of vision problems, this medication causes side effects frequently. Some of these effects are: headache, dizziness, visual problems, redness of the face, drowsiness and tinnitus ( Tinnitus).

VIagra online
Viagra is sold worldwide, currently in South Africa you can buy online, by consulting your trusted online pharmacy, online is easier, simplifies the process to obtain the drug, it is always recommended to investigate the opinions of other buyers, Have the certainty that the online pharmacy does not sell counterfeit medicines, it does not spoil its customers, for it is good to investigate a little.