How does phentermine come up in pre employment drug test?

I don't know, but If I were you I would let my employer know that you were taking that prescription before you take the test. You may, if you chose, show them the prescription. But that is entirely up to you. Your medical history is personal and private. It may save you some grief.

AnswerYes it will. Not because it is specifically tested for, but because it is "chemically similar" to at least one drug that is being tested for. The basic "drug screens" catch the stuff they were designed to catch, but do pick up some other stuff.

But, hey, it's the 21st century, and chemistry is all grown up. Even as chemistry can "see" things in tests, there are some commercially available chemical "hair treatments" (that have been chemically engineered) that may be effective in reactively removing "stuff" (the metabolic residues of "drugs" that were laid down in hair shafts during periods when the person was "exposed" to the "stuff") from hair so a person can "test clean" when the truth is that this may not be the case.

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Once a pathway to deceit is taken, it will set in motion things that cannot later be stopped. When a traveler arrives at a crossroads, it is wise to think before selecting the path on which to proceed.