Can I bring a vial of botox (pre-mix with 1 ml of NS) on the plane?

Logistics aside, one cannot practice medicine in a state without a license (that includes Botox injections).  If you do, why not have Allergan ship the Botox to your office in that state rather than pre-mixing and carrying it on?

First, I am assuming that you are licensed to practice medicine where you are going to be injecting. I am also assuming that being a licensed physician, that you are purchasing the product legally from Allergan and not on the internet where the product is not really Allegan's Botox. Botox from Allergan, when reconstituted with sterile preserved saline, safely lasts at least 24 hours without any loss of effectiveness. I prefer to keep it cool.