The R039 yellow pill is a generic 2mg Xanax (Alprazolam) produced and supplied by Actavis. R039 yellow pill is classified as a benzodiazepine, which is a class of medication that produces a calming effect on the brain and central nervous system. Benzodiazepines work by enhancing the effects of gamma-aminobutyric acid (GABA), a chemical signal that […]