Apcalis comes under a group of medicines called phosphodiesterase type 5 inhibitors. After the stimulation, it works by helping the blood vessels in male reproductive organ to relax, allowing the flow of blood into male reproductive organ. It is important to note that this drug does not work if there is no urge for love-making. It improves the production of the enzyme cGMP that promotes the blood supply to the male reproductive organ and helps the man to attain stiff form of male reproductive organ. As the male reproductive organ gets rigid, the veins and arteries in it become hard and robust thus, reducing the blood supply out of it.
As a result men are able to hold on the stiffness of male reproductive organ for longer time. Its dosage shows the effect for such a long time because only 10% of the drug is being utilized during every love-making activity and the total amount of apcalis 20mg is thrown out of the body after 36 hours.