No, hydrocodone is an opiod(which it will show up as on most test) and unrelated to amphetamine.
hydrocodone can show up but diphenhydramine can't. they don't interact with each other to show a false positive for anything.
Do you smoke marijuana? Some people lace their weed with Shake-N-Bake( cheaply made meth) and this could possibly cause you to get a false positive.
Valerian Root can test positive as benzodiazepines. Ephedra can test positive as an amphetamine.
If that chemical occurs naturally, I'd think that the test would allow for latitude in that case. So, you probably took a medication that had amphetamine in it.
No. since amphetamines are stimulants it would be almost impossible.
Chinese herb pills will throw a positive for benzodiazepines--but it's not a false positive, as there are benzodiazepines in Chinese herb pills.
Adipex (phentermine) may initially cause a false positive for amphetamines, though further testing will resolve the problem.
Phentermine may initially cause a false positive for amphetamines, though further testing will resolve the problem.
will buspirone cause a false positive for benzodiazipies
You must have taken something similar - here's a good link showing some substances that can cause false positive drug test results.
i could do .... if your test is a proper test tho i dough it
Adderall shows up as amphetamine--it's not a false positive because Adderall is made out of amphetamine.