Could promethazine make you fail your urine analysis?

Question

a friend of mine said he failed his test and it came up positive for opiates and he hasn't been doing anything at all. he did take some promethazine (phenagran). i did come across something on the web that said it could have came back positive for meth but in this situation that i was reading about the girl was taking a few other things as well as promethazine.

anyways my question-would promethazine make you fail your urine test if that is the only thing you were taking?

Answer 1

Very unlikey. Most Drug screens will perform a second confirmatory test to identify which opiate (medical or non-medical) is positive. If both tests are positive its almost certainly not phenergan.

Answer 2

Since it's close to an antihistamine it's hard to imagine it testing positive for meth or opiates.

Your friend may be on opiates though, because it can cause false positives for marijuana.