Hi, I have been taking Ambien cr (2- 12.5mg pills per night) for 7 years. DR PRESCRIBED. I have developed a tolerance to this and recently withdrawl although I did not reduce. My doctor tapered me off of the Ambien and on to xanax xr 2 mg per day. Is this counter productive? I thought Xanax was very addictive. She plans to taper the Xanax over the next few months/