Amphetamine (Ritalin, Adderall) did not help me on net, and I took >~30 mg Adderall on many days, once went up to 60 mg and tried it in combination with a benzodiazapine. Point is that I explored a wide variety of doses, including 7.5 mg, 10, 15, 20 mg / day.

Moreover, besides alcohol, amphetamine has the highest correlation with violent behavior of any drug, and even behavior that suggest that one might become violent has a significant change of very costly socioeconomic consequences.