The word "Viagra" has been already known to almost everyone. Still, let's figure out what is the drug used for and how it works.
On average, about 30% of men between the ages of 30-35 already have problems with erection and cannot live an everyday sex life. At the age of 40-50, this percentage increases.
What is interesting about the drug - when there is sexual arousal, an erection occurs. That is, Viagra increases blood supply to the penis to achieve and maintain an erection. Excitement arises from direct contact with a woman of interest to a man. Then, under the influence of Viagra, an erection appears, which the same drug maintains and holds throughout the entire sexual intercourse. After the end of intercourse, arousal subsides, and the drug again ceases to work.
Since sexual arousal depends on testosterone levels, the drug is less effective for people with low levels of male sex hormone.
The drug has little effect on men with certain diseases, for example, diseases of the inner lining of blood vessels (endothelium). If the endothelium produces little substance that is a mediator of erection, then Viagra also works poorly. This is observed in patients with diabetes mellitus and in patients with metabolic syndrome.