How long does it take for 1 30 mg Adderall (dextroamphetamine and racemic amphetamine) XR to be undetectable by urine test?

Likely . The excretion is dependent on the ph of urine and may take two or tree days to be completely gone. It will show up under the amphetamine category. Concern about a positive screen can be handled by providing testing entity with a copy of the prescription bottle which will have all of the identifying demographic information on it. Having a prescribed drug show up as expected should not be issue.