So, let’s see in details what Levitra is and how does it act. Vardenafil is a highly efficient and the most potent inhibitor of PDE-5 for the treatment of ED.
In vitro studies have shown that Levitra as opposed to other members of the PDE-5 inhibitors has more selective effect on PDE-5 – the main target of the treatment of ED than other known types of phosphodiesterase. As has been shown in studies in vitro, Levitra (vardenafil) on the impact on the PDE-5 is stronger sildenafil (Viagra) more than 10 times and tadalafil (Cialis) is 13 times. Levitra (vardenafil) has less effect than sildenafil for PDE-6 – izoenzymes, which is contained in the retina and the blocking of which lead to abnormalities in color vision, and a smaller effect than sildenafil and tadalafil, the PDE-11 in the testis. Thus, Levitra is highly selective for PDE-5, and therefore safer: the drug does not inhibit spermatogenesis and causes of defective color vision. Read more »