Levitra 40 mg is an FDA-approved medicine for treating ED. Levitra 40mg is not a sexual desire enhancer or sexual power booster. It contains the ingredient Vardenafil which increases the blood flow to the penis. It helps achieve or sustain an erection when a person is sexually stimulated. It is recommended to take one pill in 24 hours. This pill can be taken with or without food. It should be taken approximately 30 minutes to 1 hour before any sexual activity. The effects of this medicine last for around 5 hours. The dose merely increases the blood circulation in the sexual organ. It increases the blood flow into the penis and maintains an erection to give men some satisfaction.