Your doctor may lower your dose or raise your dose, depending on how your body reacts to Levitra. This results in an erection. Speak to your doctor about ways to guard against sexually transmitted diseases. If you get an erection that lasts more than 4 hours, get medical help right away. Medicines called alpha-blockers. Angina is a symptom of heart disease and can cause pain in your chest, jaw, or down your arm. Swallow several times as the tablet dissolves.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.  · General Dose Information. For most patients, the recommended starting dose of LEVITRA is 10 mg, taken orally, as needed, approximately 60 minutes before sexual activity. The dose may be increased to a maximum recommended dose of 20 mg or decreased to 5 mg based on efficacy and side effects. The best dose of Levitra for you is one that provides benefits with minimal risk. Increasing your dose of Levitra may not be more effective for ED and may increase side effects. How long does it last?