Ooh. Lucky you. This is one I have always wanted to try but it is quite rare. Theoretically, it is about 4-5 more potent than methylphenidate (and of course, much longer lasting as it lacks the instantly hydrolyzed ester moiety of methylphenidate) and is far more orally bioavailable, so a good starting dose is around 2-2.5 mg qD PO. From what I have heard, you should never go above 10mg with this chemical, unless you want to be completely and utterly spun for 48 hours straight.