Viagra is the commercial name of a compound called Sildenafil, this product under the name of Viagra became the most famous drug, for being the first to combat or reduce the effects of erectile dysfunction. The application of this drug originally manufactured by the Pfizer laboratory is simple, it acts on the parasympathetic nervous system causing the secretion of Nitric Oxide, which contributes to the relaxation of the muscles of the penis for a subsequent and correct vasodilation of the arteries that conduct blood. to the corpus cavernosum of the penis and increasing blood flow to be able to erect it.
The Viagra marked an important point in the fight against erectile dysfunction, while other laboratory began the same race, trying to synthesize a strain to do the same effect, they succeeded, representing a significant drop in sales for Pfizer. Under the name Cialis, Tadafil, a compound with a similar but faster response action, and another called Vardenafil, distributed by the brand Levitra, were developed. As a variety of drugs were produced for the same function, Viagra lost popularity, but the most discrediting of the brand was the arrival of fake copiesthat put the life of the consumer at risk, causing very dangerous side effects. Although the sale of Viagra was restricted and limited to a qualified prescription (medical prescription), the gains were incredible, so much so that in many cases this prescription filter was bypassed and turned into on-line and unsafe mechanisms such as a simple questionnaire, which which led to excessive consumption of this drug, which brought serious legal problems to the company. In addition to the legal problem, Sildenafil began to have symptoms in its users that they did not like much, such as decreased vision, eventually a skin rash that reflected a certain allergy to the product, headache after sexual intercourse, digestive repulsion to Viagra and even palpitations that once turned into severe tachycardia.
It should be noted that the synthesis of Viagra in its beginnings was for other purposes in addition to erectile dysfunction. Initially created to combat arterial hypertension, it was observed that if it encouraged the improvement of this disease, but also the patients had erections in the penis which led them to investigate the subject obtaining more favorable results in this area of medicine.
