Levitra dosage contains the active ingredient Vardenafil and belongs to the PDE-5-inhibitor group. Like Viagra and Cialis, it is one of many ED treatments which work by increasing the blood flow to the penis. It achieves this by breaking down the cGMP (a nucleotide released when aroused) enzyme which helps to reduce energy in men. which causes blood vessels in the penis to relax, allowing more blood in. This then leads to stronger and longer-lasting erections. Upon climax or the end of stimulation, cGMP is broken down and the blood flow returns to normal. Get this drug with your doctor’s prescription for safe results.