Pill with imprint S 90 3 is Green, Rectangle, and has been identified as Alprazolam 2 mg. It is supplied by Dava Pharmaceuticals Inc.. Alprazolam is used in the treatment of anxiety; panic disorder and belongs to the drug class benzodiazepines.
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Is yellow or green Xanax stronger?
And although 1-mg tablets are usually blue, some are green. As mentioned above, 2-mg Xanax bars are usually white, yellow or light green. The highest strength dose of Xanax is a 3-mg extended-release tablet. That pill is triangular — not bar-shaped — and green.

What is Green Xanax used for?
Alprazolam is used to treat anxiety and panic disorders. It belongs to a class of medications called benzodiazepines which act on the brain and nerves (central nervous system) to produce a calming effect. It works by enhancing the effects of a certain natural chemical in the body (GABA).