Pill Identification  The pill with an R039 imprint has been identified as 2mg Alprazolam (Xanax ) manufactured and supplied by Actavis.  While the rectangular green Xanax Pill with imprint S 90 3  has been identified as Alprazolam 2 mg supplied by Dava Pharmaceuticals Inc. Alprazolam belongs to a class of medications called benzodiazepines which acts on the brain and nerves (central nervous […]