... I used a 31 gauge 5/16 needle. I got a pretty fair response for a short while (30 min.) but went away when I peed. I never got intercourse "wood". I am taking Welbutrin 300 daily. Could this cause an decrease in effectiveness? How about taking a Cialis 20 mg with it? A pal said it didn't work the first time but caused a significant reaction the second time with Cialis. Thanks!