Adipex-P - Can a commercial driver take Adipex and pass a drug test?

Adipex-P ( Phentermine) belongs to the drug class of CNS ( central nervous system) stimulants, anorexiants, it is similar to amphetamine. It is a controlled substance (CSA) schedule 4.

https://www.drugs.com/schedule-4-drugs.html

Phentermine can show up on a drug test as a false positive for amphetamine.

"What medications disqualify a CMV driver?
Answer:
A driver cannot take a controlled substance or prescription medication without a prescription from a licensed practitioner.
If a driver uses a drug identified in 21 CFR 1308.11 (391.42(b)(12)) or any other substance such as amphetamine, a narcotic, or any other habit forming drug, The driver is medically unqualified.

There is an exception: the prescribing doctor can write that the driver is safe to be a commercial driver while taking the medication. In this case, the Medical Examiner may, but does not have to certify the driver.

Any anti-seizure medication used for the prevention of seizures is disqualifying.

The Medical Examiner has 2 ways to determine if any medication a driver uses will adversely affect safe operation of a CMV:

Review each medication - prescription, non-prescription and supplement
Request a letter from the prescribing doctor"

Source: United States Department of Transportation
Federal Motor Carrier Safety Administration