Green Xanax Bars are rectangular, with the imprint "SO93" on one side, and are divided into three groves. It is a benzodiazepine that increases GABA levels in the brain and has a calming effect on the bra; it reduces hyperactivity. Green Xanax bar is a medium-tendency medication with an active duration of 6 to 8 hours and an onset action time of twenty-five to thirty-five minutes.