Buy Levitra (Vardenafil)Tablets Online (nookylove), Levitra is the trade name for Vardenafil. It is a PDE5 inhibitor. The PDE5 enzyme is involved in the regulation of blood flow in the penis, particularly during erections. By inhibiting the PDE5 enzyme, blood flow to the penis is increased during sexual stimulation. Arousal is still required before Levitra will work. It is taken to support sexual performance and to promote healthy sexual relationships.