The length of time the Medicine works is important for some. Let's consider two men. One can predict when sexual activity will take place. A drug that works quickly and leaves its system quickly would then be appropriate with Viagra. The other man may know that sex will happen during the weekend but does not know exactly when it will happen. He will prefer Viagra. Also, Cialis can be taken in small daily doses, as Fildena 100 is selected for And Best Result in less time.