Mar 29, - Ativan is the brand name for lorazepam and Xanax is the brand name for as a guide only as they do not reflect individual variation.1,2,3 Both Ativan and Xanax should only Greenblatt DJ, Harmatz JS, Dorsey C, Shader RI. Atypical behavioural effects of lorazepam: Clues to the design of novel therapies? Anne Giersch a,? Do the selective effects of lorazepam signify therapeutic properties? Greenblatt, D. J., Harmatz, J. S., Dorsey, C., & Shader, R. I. (). Comparative single-dose kinetics and dynamics of lorazepam, alprazolam, prazepam, and placebo. Greenblatt DJ(1), Harmatz JS, Dorsey C, Shader RI.