i've seen indian 5mg xanax triangles. having taken them, i can say they definately had a benzo in them, as to which i have no idea. it did feel like alprazolam but was black-out central for the next week.
there are 3mg xanax triangles too, both are indian made, so be weary around them.
the only legit ones in the UK are 250micrograms and 500 micrograms tablets - everything else that is in the UK that you could buy without a prescription/off the streets are likely imported indian junk or sometimes the real 2mg bars along with the triangles i mentioned earlier. be really careful. in the UK, blisters are used on all medications. if you are buying from a shady source make sure you get them in a blister, or get prepared to be taking something which may not infact be xanax, or any benzo on that matter.
people who sell benzos in bags are usually giving you knock offs. always research them before you take them coming from experience.
in the US i'm under the impression they are prescribed up to 2mg bars but there are 3mg XR tablets.