Which is the best drug to use as an alternative to Sildenafil?

Many people who do not have good luck with Sildenafil try Tadalafil. Unlike Sildenafil that should be taken before activity, Tadalafil can be taken daily and stays in the system longer. It is the generic for Cialis. There are many drugs out there for ED, but Sildenafil and Tadalafil are the most prescribed. I hope this helps. Good luck to you!