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Will Phentermine Show False Positive In Urine Drug Test?

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Posted on Mon, 1 Feb 2016
Question: I have a prescription for phetermine that I have been on for 2 months. I have to take a urine drug test for work in 5 days. Do I stop taking it or do I keep taking it and bring the prescription bottle with me ?
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Answered by Dr. Bonnie Berger-Durnbaugh (1 hour later)
Brief Answer:
Call the human resources department at the workplace.

Detailed Answer:
Hello XXXXXXX

As you figured, the phentermine will give a false positive on the amphetamine drug screen. I would suggest calling the work place and asking for the human resources department and discussing your dilemma. They can let you know whether they have a strict policy of rejection for any positive drug tests, or, if you have a prescription/documentation of need, they will allow it. Only they can tell you what their policy is for dealing with this situation.

The other consideration is that since you have been on phentermine for 2 months, discontinuation should be gradual to avoid withdrawal symptoms, and I don't think there is enough time for gradual tapering.

So, I would suggest continuing it according to your doctor's plan, and bring in the prescription bottle. But do call them ahead to discuss this if you can.
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Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Bonnie Berger-Durnbaugh

General & Family Physician

Practicing since :1991

Answered : 3133 Questions

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Will Phentermine Show False Positive In Urine Drug Test?

Brief Answer: Call the human resources department at the workplace. Detailed Answer: Hello XXXXXXX As you figured, the phentermine will give a false positive on the amphetamine drug screen. I would suggest calling the work place and asking for the human resources department and discussing your dilemma. They can let you know whether they have a strict policy of rejection for any positive drug tests, or, if you have a prescription/documentation of need, they will allow it. Only they can tell you what their policy is for dealing with this situation. The other consideration is that since you have been on phentermine for 2 months, discontinuation should be gradual to avoid withdrawal symptoms, and I don't think there is enough time for gradual tapering. So, I would suggest continuing it according to your doctor's plan, and bring in the prescription bottle. But do call them ahead to discuss this if you can.