High activity of this medicine in the sphere of treatment of sexual problems is tested by millions of men around the world. The preparation contains several substances, one of the main is sildenafil citrate. The remaining components are indirect and have no excitatory effect on erection.

More than 80 % of men when taking minimum dose of Viagra feel increase of male power and sexual arousal. With increasing doses, the effect is to be increased. The new line of researches allowed finding an optimal and safe dose of the medicine, known as viagra sildenafil.

Impotence is an illness that bothers a lot of men who have achieved the age of 40 and over. The absence of an erection may make normal sexual intercourse impossible.

Generally, if a man has first symptoms of erectile dysfunction, he tries to mask his illness from other people and even from the closest ones, who can support in any situation. But in these cases a man is strongly recommended to visit a doctor, who may prescribe Viagra.

Is it necessary to visit a doctor before using of Viagra?