I would not mess around with that stuff, it has no recreational value and should only be used under close supervision by a doctor due to the risk of toxicity. You run the risk of developing life threatening arrhythmia, paralysis, or cardiac arrest. Carbocaine is listed as a "high alert medication" because of the significant risk of severe adverse reactions when not used properly.
In short, don't mess with it. What are you thinking is going to happen from using it?