Prozac can take anywhere from 1-4 weeks to reach its therapeutic level, and even if you stay on the Xanax for that entire time, you will have no trouble coming off it. I will assume (
Dave Matthews fan) that you are under the care of a doctor who has prescribed these meds for you. Since you have some concerns, I would suggest that you bring them to his/her attention and get the reassurance you need from the "horses mouth" so to speak.