Urine amphetamine concentration after 20 mg immediate-release Adderall
Peak urine concentrations after multiple days of dosing with Adderall in healthy volunteers have been reported in the approximate range of 5,739 to 19,172 ng/mL. [1]
Factors affecting observed urine concentrations
Urinary recovery of amphetamine is dependent on urine pH (and urine flow rate), so measured concentrations can vary between individuals and collection conditions. [2]