I took 10mg's of Levitra, and at that doseage it was just
as potent as Viagra. The major difference that I noticed was that Levitra increases sensitivity, something that I had not noticed with Viagra. I too sometimes have a "problem" from the medication for back pain that I take, and that is why my doc put me on Viagra. But I started having bad side effects on Viagra, like headache and really bad flushing of my face. That is why he wanted me to try Levitra. IMO Viagra is really good, but Levitra worked better, least for now.