Lorazepam
"From (way) past experiences, lorazepam works better than diazepam (Valium) or alprazolam (Xanax) when comparing correctly converted dosages, administered for the same purposes of anxiolysis for clinically significant anxiety related to adjustment disorders, and potentization of concurrently administered fentanyl or other narcotic for outpatient procedures, whether of a  surgical nature, or diagnostic and imaging procedures for an individual who may have difficulty remaining still for extended periods of time, as in an MRI.  While midazolam (Versed) is the traditional benzo- favorite to be combined with fentanyl via IV, especially for the better retro- and anteriograde amnesia it usually provides, midazolam is difficult to obtain by pill."