The white oval pill with the imprint GG 256 has been identified as Alprazolam 0.25 mg. Alprazolam is classified as a benzodiazepine. (A drug’s classification refers to a group of medications that work in the same way.) GG 256 pill is used to treat anxiety disorders and panic disorder (sudden, unexpected attacks of extreme fear and worry about these attacks). GG 256 pill works by decreasing abnormal excitement in the brain.