What Are Yellow Xanax Bars? When someone talks about yellow Xanax bars they are not referring to a different type of Xanax or a different formulation, it is merely referring to the appearance and how to determine the right dosage. Yellow Xanax bars refer to the color of the pills, which are yellow, and the shape, which is a rectangle. This means the user can be sure of what they're getting. Yellow Xanax bars marked with "R039" are a 2mg dose., 3071, Don Jackson Lane,, Honolulu, Hawaii, 33034  (Show me directions) Show Map

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