Green Xanax bar is the 2-milligram dose of alprazolam in an elongated rectangular-shaped green-colored pill. It comes in the size of 15.00mm, having an imprint “S 90 3” on the scored side. The bar is available only on prescription as it contains a high dose of Xanax. nInactive ingredients of a green Xanax bar are corn starch, sodium benzoate, silicon dioxide, microcrystalline cellulose, magnesium stearate, lactose, docusate sodium, crospovidone, and color additives FD & C Blue No. 2 and DC & C