All persons wish to lead lucky sexual life and the age does not seem to be important. However, a few males have big troubles with their erection. It agitates them greatly and lowers their self-rating. And of course everybody wants to up to the mark in sexual affairs. In the most urgent situations impotence may lead to the worsening and even break of relations.

Viagra (Sildenafil), Cialis (Tadalafil) and Levitra (Vardenafil) are 3 drugs for impotence which are almost the same from the point of view of pharmaceutics. At the same time, producers of each medicine strive to prove that it is better than others, for the purpose of advertising. And it is the success of ad campaigns rather than health indicators that will define which of these drugs would be the most prevailing. To buy Viagra online you are welcome to search on the Internet. There one may also buy Cialis online.

All 3 drugs belong to the series of phosphodiesterase type 5 inhibitors. The enzyme that retrains the expanse of veins of the penis is PDE-5. So it enfeebles erection. Viagra and Levitra are rather similar in organization and properties, and the composition of Cialis is a little different.

But Levitra is fast taken in and Cialis is heavily driven out of the body, and that's the main distinction between the drugs in fact. That is all FDE-5 inhibitors vary in time and duration of action but the effect they produce is practically the same.

All three drug preparations reach beneficial outcomes in about 80 percent of situations.

But Levitra is effective in rather small doses. The dose is 5-10 times smaller than those of the rivals. This a little decreases the density of side-effects, but with disorders of cardiovascular system and after the cerebrovascular accident drug is as before contraindicative.

One more under-effect is that all 3 medicaments block all the other enzymes comprising the “necessary” FDE-5. For instance, chromatic sensitivity for which FDE-6 enzyme is answerable can be influenced by Viagra and Levitra. The brain, heart, or thymus gland are regulated by FDE-11, the activity of which may be held back by Cialis. But nobody has yet found out what precise unsuitable outcomes it may bring about.

Another significant question is the interaction of these medicaments with food and alcohol drinks. It is obvious that it is better to take Viagra on an empty stomach so as to get better and fast impact than with a meal. But anyway the effect still happens though lingeringly. The promotional prospectuses of Cialis ensure that it doesn't interplay with alcohol drinks, in contrast to the competitors. As a matter of fact, there's information that Levitra is also innocuous in conjunction with alcohol, only this “trump card” has not yet been used by the marketers convincing all to buy Levitra. It's evident that the “trump card” is equivocal: 1 of the frequent causes of erectile dysfunction is drink overindulgence.