Vidalista 20mg works using the property of its active drug for the treatment of erectile dysfunction because the active drug is tadalafil and its property is to inhibit the PDE5 enzyme in the body. When the active drug Tadalafil blocks the PDE5 enzyme, the body carries out nitric oxide production unimpeded and works to expand the blood vessels that line various parts of our body, and the penile shaft is one of them. When a man feels any kind of arousal, the body directs more blood to the penile area which flows through the now dilated blood vessels around the shaft of the penis and makes it hard and erect. This entire process can occur many times while the drug is active in the body as long as there is sexual stimulation. Essentially, the PDE5 inhibitor drug, Tadalafil, makes Vidalista 20 effective in treating erectile dysfunction by blocking the PDE5 enzyme and creating conditions conducive to the production of sufficient nitric oxide.