What Does Phentermine Show Up As On A Drug Test - Since phentermine has a similar structure to amphetamines, a urine drug screen can test positive for amphetamines. The original result will then be ruled a false positive. This will signal the need for a confirmatory test, which will then show that it was phentermine and not amphetamine or methamphetamine. Web no, phentermine is not likely to show up on a drug test. However, it can cause a false positive for amphetamines because of how the medication works, which is why it may show up as adderall in some drug tests.
However, it can cause a false positive for amphetamines because of how the medication works, which is why it may show up as adderall in some drug tests. Web no, phentermine is not likely to show up on a drug test. The original result will then be ruled a false positive. This will signal the need for a confirmatory test, which will then show that it was phentermine and not amphetamine or methamphetamine. Since phentermine has a similar structure to amphetamines, a urine drug screen can test positive for amphetamines.