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Viagra is a highly effective medicinal product for treating erectile problems. The frequency of search queries like ‘I want buy viagra ua’ proves its popularity and high demand for it. But how does this medication work? To remedy erectile dysfunction it blocks a chemical which is responsible for stopping erection. Thus, more substances causing erection remain and the penis muscles do not constrict. In such a way blood is left in the penis longer and a man maintains an improved erection. Since Viagra does not influence the chemicals which cause an erection, it is not effective without some stimulation. When a man is aroused, brain sends nerve signals to release certain chemicals. These chemical substances cause muscles in the penis arteries to relax and large flows of blood enter the penis making it erect. This process is reversed by phosphodiesterase type 5 (PDE5) enzymes, which make the penis constrict again. Viagra blocks these enzymes making an erection last longer. Free viagra samples might help you to understand this process better from your own experience.