I've been on .25mg's if Xanax (Alprazolam) for about two years now. I must say that it has been a life saver and has significantly decreased the amount of panic attacks I've had. For the past week or two my anxiety seems to be worsening. I've had a really tough week and have had two full blown panic attacks. It always seems to happen about 1/2-1 hour before I can take my next dose of Xanax that my anxiety level starts to rise. An RN recommended that I stop using it because I might be getting what is called a "rebound effect." Has anyone experienced this? Is it that I'm getting used to the dosage and it's not helping? Advice or shared similar stories would be greatly appreciated.