I was on Ativan for a time years ago. I experienced dry mouth from it...but I noticed when I increased my water intake the dry mouth (ugh)went away.
My dosage was 2 to 4 mgs.at bedtime. (Do not take it if you are taking Kava...as it might increase the sedation.) I had previous to that, been on Valium. I had no withdrawal symptoms whatsoever upon switching!
However...everyone is different. Oh, and smoking may decease this drug's effectiveness!

Talk with your Doctor if you still have lingering questions regarding this drug. Nothing replaces a good Dr./Pt. relationship!
TGC!