Because
Xanax is my favorite pill of all time...
I've been prescribed to
Xanax XR 3mg and I'm almost sure that there are 4 and 5 mg XR as well. The only reason I say this is because my psychiatrist had a sticker attached to my prescription paper. On the sticker it had 1, 2, 3, 4, and 5 mg tablets. Keep in mind these are XR.
Regular, non XR, xanax comes in .25, .5, 1, and 2 mg. 1 mg are often called footballs and are blue while 2 mgs are called bars or totem poles. I love bars.