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Viagra® is a drug whose active substance is Sildenafil . It was released in 1998 in the United States and Europe. This oral medication is a vasodilator that acts specifically on the penis . To better understand how it works, it is worth understanding what an erection is .. During sexual stimulation, there is release in the cavernous body of the penis of a neurotransmitter called nitric oxide (NO). This release of nitric oxide will lead to an increase in a mediator allowing erection. Viagra inhibits an enzyme, phosphodiesterase type 5. It is this enzyme which is responsible for the degradation of nitric oxide which allows erection. The inhibition of type phosphodiesterases (PDE5) by sildenafil citrate allows an increase in this mediator. This will allow a relaxation of the blood vessels favoring an influx of blood into the cavernous body and the smooth muscle fiber leading to an erection, during sexual arousal. "summarizes Dr. https://www.viagratrader.com/2020/12/08/????-??-????-???-????-???%E2%80%8B/ ® for men: at what age, in which cases?Viagra® can be taken in men, from the age of 18 , if they have erectile dysfunction "whatever it is, after a medical and psychological evaluation" explains Dr. Faix. The causes of these disorders can be: cardiovascular risk factors, factors related to treatments, in particular for the prostate or prostate cancer, or even psychotropic drugs, hormonal imbalances with testosterone deficiency mental disordersHow to take it?" Viagra® is a facilitator, not an inducer," explains Dr. Faix. , stimulated and willing to have a report."What are the effects?"The desired effect is of course a facilitation of erection, a more qualitative and longer lasting erection " sums up Dr. Faix. There are adverse effects, often transient and generally not requiring discontinuation of treatment, in 10% of patients: headache, flushing of the face, digestive disorders, or dizziness . In very rare cases and when taken in too high doses and in combination with psychotropic substances, viagra can also give prolonged erections : it is then advisable to consult quickly .