I just had my breast MRI a week ago and because I’m claustrophobic, they prescribed one Xanax to take 45 minutes beforehand. I’d never taken one before and honestly I did not feel any different but my mind just wandered off during the MRI and I wasn’t bothered by it at all …except the hard plastic divider between your breasts which was uncomfortable for me. I would do the Xanax again for sure.