OP: hope you didn't go ahead and try this. Its not able to be done IV. I would just take it orally or parachute it, that's my fav way to take Xanax, it tastes like ass to chew it and the taste lingers for ever... gross. But like other have stated alprazolam(Xanax) is not water soluble so can not successfully be shot with heroin. That would be pointless and stupid to try this. You would have way too much filler/binder from the Xanax mixed with dope, and the Xanax wouldn't even be dissolved making the solution way more thick and harder to prep than needed, as opposed to just mixing H with water for the shot of dope and just taking the pill orally.