Green Xanax bars marked "S 90 3" are a prescription medication containing alprazolam, which belongs to the benzodiazepine class. They are primarily used to treat anxiety disorders, panic attacks, and sometimes insomnia. Alprazolam works by enhancing the effects of a neurotransmitter called GABA in the brain, which produces a calming effect. These green bars are typically 2 mg each, a... https://zonderrecept.org/product/green-xanax-bars-s-90-3/