No, Phentermine is not an Amphetamine. Phentermine is, however, similar chemically to the Amphetamines. In the diagram below, we have reproduced the molecular structures of Phentermine, Methamphetamine and Amphetamine.
The three molecules are chemically similar, but are not identical.
Note: The pictures are not showing but heres a link to it if you want to see the difference. http://www.phentermine.com/phentermine_faq.htm#4
As Phentermine is similar chemically to Amphetamines, it may cause a positive result in urine screening tests for Amphetamines
Currently, no clinical study is available that measures the length of time that Phentermine will stay in your body after you stop treatment.
Hope this helps and again I dont think it should be a problem with the urine test as long as you tell them your on them and show them your prescription bottle with your name.
Good luck!
Michelle
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