I have done it a few times with out any major problems. I was actually pretty good, but from now on I'm sticking to just Cialis. It works well enough on it's own for me, and Viagra sometimes gives me a headache. Mrpg13
My friend carries a liquid cialis and was just talking to me and a couple others about making this very same thing! He is going to try it and give out some samples to see how people respond to it and if it does well he will have it in full production!
I personally think cialis or Viagra will do the trick on there own, but I have never tried the combo so my voice is not an experienced one! I will let you know once he makes the samples and gives me one!