I will be taking a drug test for a job (that I really want) that I am applying for in the future.

My concern is that I am taking prescription Adderall.
I have heard people say that taking Adderall can cause certain unfavorable ratings on common drug tests. (In which category I am unsure but i can only assume something related to the illegal drug 'speed' for its amphetamine content)

Is this true?
I am concerned that if they see poor results on my drug test, they will automatically, without consulting me, disregard my application.

So I guess my main question is:
is it true that Adderall will show up on a drug test?

I know generally a drug test searches for illegal drugs; but i want to make sure that Adderall will not show up as an illegal substance.

Thank you in advance for your help.
I appreciate your time.