Viagra and its generics (Cialis and Levitra) are the main medicines are for the treatment of erectile dysfunction, which, according to the pharmaceuticals, are very similar to each other. However, they compete against each other in advertising campaigns.
Viagra, Cialis and Levitra belong to the PDE5 inhibitors, which prevent the vasodilation of the penis, and improve erection. Viagra and Levitra have almost the same ingredients and characteristics, while the structure of Cialis is slightly different. You can buy these drugs on kamagraperth.com.