Levitra on the basis of vardenafil has a positive effect on the male body. It is enough to take 1 tablet of the drug to feel the desired effect. The pill will start working in half an hour after taking it. The effect will gradually decrease over a period of 5 hours. After the end of the action of the drug, the onset of erection may be difficult if there are certain problems with the body. The principle of action of the drug is as follows: vardenafil is an inhibitor of FDE5. Under the influence of the drug, smooth muscles in the small pelvis relax, arteries also relax, which leads to increased blood flow in the penis.