Generic Cialis and Levitra are two anti erectile dysfunction drugs that are abundantly used by men for treatment purposes. The generic terms for these are tadalafil and vardenafil respectively. Generic tadalafil and vardenafil are two drugs that were introduced in the later years and gained immense popularity. This is to say that these drugs are bought on a large scale by men. It is a good idea to compare the two before deciding on which one to buy and to use. Generic Cialis is a drug that starts working within twenty minutes of consumption and lasts up to thirty six hours. For this purpose it is also known as the weekend drug. Generic Levitra starts giving effect after twenty minutes as well but the effects last up to twenty four hours. Both Generic Cialis and Levitra are recognized and authorized drugs that have been proved to be effective by various tests. There is no real winner in a contest between Generic Cialis vs. Levitra since each one can be suitable for different people.