Levitra (vardenafil) is a medicine specially intended for men suffering from impotence and unable to enjoy normal sex life as a result of this disability. Erectile dysfunction can affect men of any age and can cause psychological discomfort and problems in personal relationships. To make sure taking Levitra is going to be safe for you, you will need to discuss with your health care provider all the aspects of your treatment. Any allergies and medical conditions you have are supposed to be reported. The following medical conditions can affect the dose you are prescribed and interfere with the effects of Levitra if the dose is too high: Peyronie's disease, cavernosal fibrosis, heart attack, high or low blood pressure, diabetes, irregular heartbeat, cholesterol, blood cell problems, ulcers in the stomach or intestine, chest pain, liver, kidney, or heart disease, bleeding disorder, or stroke. You can carry on with your treatment if you experience a few mild side effects of Levitra, as they are likely to go away when your body adjusts to the new medicine and its dose. The following mild side effects are possible: stuffy or runny nose, dizziness, fainting, heartburn, lightheadedness, and upset stomach. More serious side effects can be quite dangerous if not treated timely and properly, for example the following ones: irregular heartbeat, ringing in your ears, shortness of breath, feeling light-headed, penis erection that is painful or lasts 4 hours or longer, swelling in your hands, chest pain, sudden hearing loss, general ill feeling, nausea, sudden vision loss, seizure, and sweating. Taking certain medications can change the effectiveness of Levitra, increase the risk of irregular heartbeat or cause serious life-threatening effects, such as heart attack or stroke. Never use nitrate-based medications along with Levitra. If you are not sure whether the drug you are taking can be classified as a nitrate-based drug, talk to your pharmacist or your doctor. Nitrate-based drugs are usually prescribed for chest pain and combined with Levitra can produce a sudden drop in blood pressure. You can continue taking Levitra if you get such mild side effects as upset stomach, back pain, stuffy nose, headache, memory problems, vision changes, and warmth or redness in your face, neck, or chest, as they are not expected to last for too long. More serious side effects are unlikely unless you have any risk factors your doctor will tell you more about.