The Concerta will show up for one to three days (in a urine test) depending on
how fast you metabolize. However from what I have read,
it will show up in the initial screening as a general amphetamine. After a positive initial screening, the sample will be further tested using a different methodology that will specify the type of amphetamine. Of course, if you have taken your generic version of adderall after the concerta for a couple of days. That should be what shows up.