If you've heard about Generic Viagra, chances are, you've also heard about alternative drugs produced by other companies, including Levitra, which is known by its generic name vardenafil. Which is the best to use for Erectile Dysfunction? The answer may be different for each person, so before you buy Viagra Levitra, it is always best to note their differences. First and foremost, since they have different composition in terms of chemicals, they have differences in terms of how fast they work and how long they last, as well as side effects which may surface. As to dosage, Levitra requires 10 mg per day, as compared to Viagra's 50 mg. Both must be taken without food and anywhere from thirty to sixty minutes to work, and both last up to four hours. They can only be used once a day, and have similar side effects, like headaches, nasal problems, indigestion and other stomach problems. Given that the effects are similar, the only advantage of taking Levitra over Viagra is that it requires a lesser dosage for it to work. You may need to search for more information before you go out and buy Viagra Levitra. Of course, before you buy Viagra Levitra Generic Cialis, you should always consult your doctor who can explain more extensively both the effects and the side effects of each drug, to help you make the decision.