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Usually they shouldn't show up during a routine drug screening. I've never seen a drug assay kit that included a test for sympathomimetic amines. The only way I know of they can be tested for is using a very expensive oil-emersion test. Didrex is a different story, one of its metabolites in methamphetamine. This is in very, very small amounts that shouldn’t even show positive in a routine drug screening. The only time my doctor ever had this happen was with a government employee being tested with the very expensive oil emersion test. They didn’t even bother testing for sympathomimetc amines.
Ask your employer or just don’t take the drug for a couple days before the test.
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