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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Are Phentermine And Amphetamine Of Same Composition?

Hello, I read about phentermine and amphetamine being one of the same etc. I also read the opposite. I ask because I am taking small dose of Axcion (phentermine) 15mg vs 37.5 for weight loss. I took this on 6/18 and did a 10 panel drug test today for pre employment. I didn t even think to disclose or ask but after speaking to my cousin, she freaked me out. These pills were given to me by my sister therefor I have no rx. So not sure who or what to believe. Any advice? I really want this job and I had no idea how it could cause these false readings etc. What is true?
Tue, 31 Dec 2019
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General & Family Physician,  's  Response
Hi,

I can understand your concern about the 'false positive' test for amphetamine.

Yes, phentermine has a similar structure to amphetamines, it can turn up a false positive on urine drug screens for amphetamines.

Phentermine is an 'appetite suppressant' commonly prescribed to assist people with weight loss. Because it is quite similar to amphetamines and act as a stimulant, hence it is a controlled substance and are often sold illicitly.

Phenteramine can be detected in the blood for (up to 24 hours), in the urine (up to 4 days), and hair (up to one month).

A 'false positive' result will signal the need for a confirmatory test, which will then show that it was phentermine and not amphetamine or methamphetamine.

So, in view of the above, I advise you to wait for at least 4 days so that the urine test will be negative for phentermine or go for the confirmatory test that will actually show phentermine but not amphetamines.

Hope I have answered your query. Let me know if I can assist you further.

Take care

Regards,
Dr. Mohammed Taher Ali, General & Family Physician
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Are Phentermine And Amphetamine Of Same Composition?

Hi, I can understand your concern about the false positive test for amphetamine. Yes, phentermine has a similar structure to amphetamines, it can turn up a false positive on urine drug screens for amphetamines. Phentermine is an appetite suppressant commonly prescribed to assist people with weight loss. Because it is quite similar to amphetamines and act as a stimulant, hence it is a controlled substance and are often sold illicitly. Phenteramine can be detected in the blood for (up to 24 hours), in the urine (up to 4 days), and hair (up to one month). A false positive result will signal the need for a confirmatory test, which will then show that it was phentermine and not amphetamine or methamphetamine. So, in view of the above, I advise you to wait for at least 4 days so that the urine test will be negative for phentermine or go for the confirmatory test that will actually show phentermine but not amphetamines. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Mohammed Taher Ali, General & Family Physician