Home > Infographics > Will Phentermine Show Up On A Drug Test? [Infographic]Will Phentermine Show Up On A Drug Test? [Infographic]Do you have random drug tests at work? Or know you have one coming up? Phentermine can cause a false positive for amphetamines, given their similar chemical structure. So, check out the infographic below to learn a little more, or visit our blog post on phentermine and drug tests to read even more about this topic!