I"m wondering the same thing about how long to be off them. I've been off for 3 weeks now - thought I needed to wait longer before starting back up. How long should you be on before going 'off' again?
I used "Xenaless." It has the same ingredients as Xenadrine, only it's cheaper. I took it for 3 weeks and liked the effects. However, my heart rate sky rocketed during cardio so be careful. I've been off of it for a week, but I plan on taking another 3 week cycle in another week or so. I may also cycle in ALA - that last bit of stomach fat just won't go!
I had the same effects with Hydroxycuts that you did eventually I had to try something else. I know that everyone is different and I have tried just about everyting out there. I have had the best results on Dymetadrine Xtreme. I am curently taking it now and I love it. You are not supposed to have to take a break from it like others. I have been on it for about 6-weeks. I take it pre-workout about 1-hour before and the energy and pump that I get is outrageous... seems like I can work out forever.