Viagra is a popular drug, that treats an erectile dysfunction. Viagra contains sildenafil – it works by blocking the enzyme that inhibits blood flow to the penis. Viagra is available only on prescription, but you can buy its substitutes with a similar composition without a prescription. Check the effectiveness of Viagra.
Viagra’s properties were discovered accidentally during tests to find a drug for hypertension and ischemic heart disease. During laboratory tests, it turned out that although sildenafil does not cure circulatory diseases, it helps to induce penile erections. The substance was patented in 1996, and two years later it was marketed under the name Viagra (Sanskrit vjaghra), which means “tiger” in the Sanskrit word.
Erection problems are often associated with overproduction of an enzyme called type 5 phosphodiesterase. It breaks down substances responsible for blood flow to the penis. If phosphodiestria is too much, the member drops prematurely, even if the man is excited. The sildenafil contained in Viagra inhibits the action of the harmful enzyme and keeps the blood vessels in an expanded state. This allows you to strengthen and extend the erection.
Viagra works for about 4 hours. This does not mean that for a long time the member will be constantly in erection. 4 hours is the time when you can get an erection as a result of sexual stimulation.
The indication for the use of Viagra are prolonged erectile dysfunction, which consist in the inability of a man to obtain or maintain an erection to the extent that the relationship can be achieved. Viagra only works in men with erectile dysfunctions who have a psychological or neurological background. This medicine will not help cure erectile dysfunction caused by too low blood pressure or atrophy of the penile corpora.
For Viagra to work, the man must be sexually aroused. This preparation does not allow you to get an erection involuntarily, without a clear desire for sex.
Viagra can only be bought with a prescription. However, there are substitutes for Viagra with the same active substance – silfenafil, which are available without a prescription.
Among the substitutes of the drug with the same effect as Viagra but without a prescription are: MaxOn Active, Maxigra Go, Inventum.
There are also supplements on the market containing vardenafil, a derivative of sildenafil, the use of which gives similar effects. The trade name of tablets is Levitra and Staxyn and you can also buy them without a prescription.