Vardenafil belongs to a group of drugs termed PDE-5 inhibitors and an active ingredient of Vilitra 10. Hence, whenever men having ED get sexual stimulation after taking this medicine, the formation of PDE-5 enzymes gets restricted. Further, due to this activity the cGMP level in the penile region increases and allows more blood flow in the penis. Once more blood is in the blood vessels of the penis, the tissues and thin walls of muscles get smoothen. Afterward, men have ED because relaxed muscles and tissues at the penis achieve an erection required for sexual activity.