Not Medical Advice: White, oval-shape pill with S 900 imprint has been identified as Alprazolam 0.25 mg.
Xanax is the trade name of alprazolam and belongs to a drug class called benzodiazepines that work by slowing down the movement of chemicals in the brain that may become unbalanced.
Alprazolam is used in the treatment of anxiety, depression, tinnitus, panic disorder, dysautonomia and more.
Tip! Learn Anxiety and Panic Disorder Prevention from WebMD.