Do you know how much you would use normally?
It really depends on the quality. I would ask who ever you are getting it off (find out their ROA as the dosages will differ between them.), if not, start off with Erowids suggestions. Also check what their
IV
Threshold 5 mg
Light Stimulation 5- 10 mg
Common Stimulant Dose 10- 40 mg
Strong (rushing) 30- 60 mg
Very Strong (strong rushing, intense euphoria) 50- 100 mg