The structures aren't even close. It wouldn't show up as a benzo at all. If, as @H20shed65 said, the piperazine ring would trigger the immunoassay for benzos there would be so many false positives for other OTC drugs too. Such a non-selective immunoassay would have been scrapped.
IMO, it will not show up on even the initial dipstick test. Look online for a good price on a dipstick drug test and find out for yourself if you're still unsure.
Diazepam (notice that it is a seven-membered double nitrogen ring (diazepine ring), and not a six-membered piperazine ring
Hydroxzine (similar atoms, different bonds and ring sizes)
Last edited by audacity; 05-09-2013 at 12:51 AM.
"Tolerance to the anxiolytic effects (of BZD's) probably does not occur"