Levitra is used to treat male sexual function issues (such as impotence or erectile malfunction). Levitra, when combined with sexual stimulation, increases blood flow to the penis, allowing a man to get and maintain an erection. This medication does not protect against sexually transmitted diseases (including HIV, hepatitis B, gonorrhea, and syphilis). This medicine also causes some side effects. Some of them are:  Symptoms of a heart attack include chest pain or pressure, pain spreading to the jaw or shoulder, nausea, and perspiration. Vision alterations or abrupt vision loss, The erection is painful or lasts longer than 4 hours. ringing in the ears or abrupt hearing loss. irregular heartbeats. Swelling in your hands, ankles, or feet Shortness of breath.