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Hello from justAnswer. This is Dr. Love.
The phedimetrazine is a type of amphetamine, so can cause a positive urine drug screen for amphetamines. The confirmatory test will be able to determine the exact drug that is present.
However, since you have a legal prescription for the phendimetrazine, you will not be considered to have failed the test. When someone is taking a drug according to a valid prescription, the detection of that drug on a pre-employment drug test is not an issue and the person will still pass the drug test.
So, while the drug can be detected by the pre-employment drug test, you will still pass the test.
If I can provide any additional information, please let me know.