There's three medications on the market. Viagra, Cialis, and Levitra, the primary difference is duration. Cialis has a longer time that it's in your system. That's why they're marketing more of ...

It also takes Cialis and tadalafil anywhere from 30 minutes to 6 hours to take effect. Whereas you can feel the effects of Viagra anywhere between 30 and 60 minutes. Another difference is the dosage.