Viagra is the word that is known almost by every person in the world. The product generic viagra, which is suggested by our medical corporation, is similar to brand ?Viagra? by the chemical composition and action. It greatly heightens the potency in men who have erection disorders and even helps in cases of complete impotency. This disorder is specified by absence of erection sufficient to carry out a sexual act, or by an impaired erection. Erectile disorder may be called by different reasons both of a psychological character and a physiological one. Due to the results of clinical tests the usage of Viagra is efficient in about 80 percent of the occasions of erectile dysfunction. The basic principal of Viagra effect is blood influx to the penis and prevention its reflux. As a result, the erection can't be independent, but it happens only in the case of sexual arousal. The basic point in this principal is that Viagra doesn't replace the natural processes, but only increases them. Also, Viagra helps call romantic feelings by means of providing brain with oxytocin. Oxytocin is a hormone that awakes romantic feelings.

Viagra doesn't influence man's reproductive functions. There are also a lot of dealers on the internet who propose online Cialis.

Levitra is the safest drug. Levitra is rather young medication and it is an innovation in the field of ED medications. In some cases it isn't suggested to cure erectile dysfunction with the use of such remedies as Cialis and Viagra, for example, in patients with cardio ischemia and diabetes. And the first aspects that commonly lead to the development of erectile dysfunction are cardio-vascular sicknesses, smoking, fatness and diabetes. But Levitra is the preparation that has in the composition only one fifth of that Viagra. It makes Levitra special in the usage and reduces diverse risk factors that may occur while utilizing Viagra or Cialis. Thus, one can claim that Levitra has a larger safety profile, esp. for men suffering from cardio-vascular diseases and diabetes. Also Levitra is 3 times superior Viagra in terms of duration of the effect, providing the willingness of men to a sexual act during twelve hours after taking. You would buy pharmacies online on various web sites.

Cialis is the most effective medication. Generic Cialis is an analogue to a Brand Cialis by its chemical composition. It has the same effect in cure of erectile disorder, when a male has depleted erection and the strongest form of this disorder ? impotence. Cialis supplies blood influx to the genitalia, in doing so the erection doesn't appear involuntary, but only in response to sexual arousal. The basic point in this principal is that Cialis doe not substitute the natural processes, but only makes them better. It is to be said that Cialis has no influence on male's reproductive functions. The difference between Cialis and Viagra is in less number of minimal essential active elements. The minimum essential dose taking Viagra is 25 mg (but in many cases this dose increases to 50 mg) and the dose for Cialis is 20 mg. The possibility of side effects disappears due to such low dosage. One more advantage of Cialis is more continuous time of efficiency.

The time of the effect of Viagra is 4 hours, of Levitra is 12 hours and of Cialis is 36 hours. If you are willing to order Cialis, you may do it on the internet.