Levitra (vardenafil) is a prescription PDE5 inhibitor intended for males unable to have sex because of erectile dysfunction (unable to get or maintain an erection sufficient for penetration). You can take this drug about an hour before having sex. Levitra works for most patients using it although some sexual stimulation is still required. However, you need to talk to your doctor before using this medicine - and report any of the following conditions: irregular heartbeat, high or low blood pressure, stroke, liver, kidney, or heart disease, cavernosal fibrosis, high cholesterol, chest pain, ulcers in the stomach or intestine, diabetes, Peyronie's disease, bleeding disorder, heart attack, or blood cell problems. Your doctor may start you on a lower dose of Levitra to see how you react to the treatment. Serious side effects of Levitra are unlikely but still possible. Tell your doctor if you get shortness of breath, chest pain, irregular heartbeat, sudden vision loss, seizure, pain spreading to the arm or shoulder, vision changes, swelling in your hands, ankles, or feet, ringing in your ears, or light-headedness. The presence of these side effects means your treatment is not going quite right.