Some men with erectile dysfunction, or ED, find they can return to an active sex life by treating an underlying condition, such as high blood pressure, or with counseling and lifestyle changes. But others find they may need medication to get and keep an erection. The FDA has approved several prescription drugs you take orally to treat ED. These medications all work similarly to each other. However, there are subtle differences in how long they stay effective and how quickly they begin to work. Levitra takes about 30 minutes to start working and the effects last a little longer than Viagra, about 5 hours. It contains the same active ingredient as Levitra and can begin working in about 15 minutes. Viagra takes around 30 minutes to become effective and lasts about 4 hours. I would like to thank you for the excellent service that you have given me. I ordered Zithromax on the 12th and recieved it today the 18th. I am a professional urologist and to make things clear I would like to explain the mechanism of male erection. I am impressed and will refer your company to others. Erection takes place when blood flows into the penis, provided the penis valves prevent the blood from flowing back during the erection. The blood flow into the penis starts as soon as the brain pulses a signal, which is delivered by nerves to penis blood vessels. Therefore, any obstacle on the way from the brain to the penis valves may result in erection failure. This occurs pretty often and is known as erectile dysfunction. The causes of erectile dysfunction are numerous; among them is diabetes, hypertension, valve defects, low testosterone level, atherosclerosis, psychiatric disorders and many others. Cheap pfizer viagra uk Can doxycycline cure syphilis Levitra tablets contain 5mg, 10mg or 20mg of the active ingredient vardenafil. Find out which dosage suits you best and order your medication online. Levitra Tablets is a brand of medicine containing the active ingredient Vardenafil. Find out about side effects, who can take it and who shouldn't use Levitr. Levitra relaxes muscles and increases blood flow to particular areas of the body and is used to treat erectile dysfunction. Learn about side effects, interactions and indications. Levitra (vardenafil) relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Levitra is used to treat erectile dysfunction (impotence). Levitra may also be used for purposes not listed in this medication guide. Taking Levitra with certain other medicines can cause a sudden and serious decrease in blood pressure. Do not take vardenafil if you also take riociguat (Adempas) or a nitrate drug such as nitroglycerin. Do not take Levitra if you are also using a nitrate drug for chest pain or heart problems, including nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, and some recreational drugs such as "poppers". Taking Levitra with a nitrate medicine can cause a sudden and serious decrease in blood pressure. You should carefully read this instruction of the medicine Levitra. This instruction describes the medicine Levitra in the pills dosage of 5, 10, 20 mg. You should consult your physician in the case you have some questions about this medicine. The medicine Levitra is prescribed for the treatment of male erectile dysfunction. The erectile dysfunction is the inability to get and to keep a constant erection during sexual intercourse. Levitra is produced in the form of film-coated tablets, one blister contains 1, 2, 3, 4, 6, 8, 9, 12 pills. 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