Dexedrine And Wellbutrin Drug Testing?

I am prescribed 300 mg Wellbutrin but just took a 10 mg Dexedrine (not prescribed). I have a pre-employment drug screening coming up soon (within the next week) and was wondering the following question:

Knowing that Wellbutrin can cause a false positive for amphetamines in some circumstances on a standard drug test, would these amphetamines show up as the same as those in Dexedrine? Could I hypothetically avoid further (more comprehensive) testing by showing them a prescription for Wellbutrin? Additionally, would 7 to 10 days from the date of ingestion be enough to completely clear the Dexedrine from my system? This is a one time use of Dexedrine, not habitual by any means. Additionally, any advice for flushing Dex out would be appreciated.

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Dexedrine is dextroamphetamine sulfate, so you will fail because of that, depending on frequency of use and amount of use, amphetamines are completely out of your system within 3-7 days. Since you said it's was a one time use of Dexedrine, it should be out of your system in 3 days. Amphetamines are water soluble, so drinking lots of water should be all you need to do to clear it. Wellbutrin can cause false positives for amphetamines, but contains no amphetamines itself.

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