Safe limit for adderall (dextroamphetamine and racemic amphetamine)?

30-40 mg. In general 30-40 mg per day is the recommended limit, but doctors may recommend high doses based on their clinical judgement and the patient's needs.
Adderall (dextroamphetamine and racemic amphetamine) limit. I would not recommend higher than 60mg. per day, in divided doses.
Adderall (dextroamphetamine and racemic amphetamine) dose. The fda recommended max dose is 60 mg/day for Adderall (dextroamphetamine and racemic amphetamine) xr, and 40 mg/day for adderall (dextroamphetamine and racemic amphetamine).