Remember, for Levitra to work you need to be aroused. Generic versions of sildenafil, vardenafil and tadalafil are available. Levitra for erectile dysfunction dosage How much does Levitra cost? Levitra should remain active in your system for up to five hours. Levitra was first introduced onto the market by Bayer Pharmaceuticals in It involves using a wandlike device (transducer) held over the blood vessels that supply the penis. It creates a video image to let your doctor see if you have blood flow problems. This test is sometimes done in combination with an injection of medications into the penis to stimulate blood flow and produce an erection. Psychological exam. In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an test1.ru drug does not protect against sexually transmitted. How does Levitra work for ED? Levitra, like Viagra and Cialis, is what’s called a phosphodiesterase type 5 (PDE5) inhibitor. These types of medications work by blocking your body’s production.