can result in a false positive for benzodiazepines
, tricyclic antidepressants
and sometimes even methadone
So there is a chance it could trip your DXM
test too, as DXM sometimes also triggers a preliminary positive for PCP.
Benadryl (Diphenhydramine) - false positives for benzodiazepines, PCP, tricyclic antidepressants (Reference: 45)
Benadryl (Diphenhydramine) - false positives for PCP (Reference: 24, 62 and 65)
Kelner MJ. Positive diphenhydramine interference in the EMIT-d.a.u. assay. Clin Chem. 1984; 30:1430. Letter.
Possible False Positives Triggered:
Diphenhydramine, especially at high doses, has been reported to cause false positives for Benzodiazepines (such things as Xanax or Valium) 1. The false positives occur using the screening-type tests (sticks, cups, etc) but confirmatory tests using GC/MS and other more rigorous techniques should clear any false positive. Other sources list Diphenhydramine as a possible source for false positives for PCP2 and tricyclic anti-depressants3.
This would normally not be a concern, as diphenhydramine is an over-the-counter drug
and as such is legal. However, you are being tested for DXM which indicates a propensity to abuse over-the-counter drugs
and probably concern on the part of some professionals or other. Since that is the case, consuming large amounts of any otc drug will probably count against you for whatever reason, as people who abuse otc drugs at a young age commonly suffer from underlying mental illnesses related to depression, antisocial thinking and behavior, isolation/alienation and all those fancy words for thinking that life sucks.
Probably better not to take the diphenhydramine in this case and also for all the other reasons why you shouldn't abuse diphenhydramine (because it's a dangerous deliriant with potentially detrimental effects to your health.)
Willyzh added 3 Minutes and 27 Seconds later...
Perhaps you will begin to ask yourself why you are drawn to "painfully interesting psycho(active drugs)" when there is so much else life has to offer, especially if you are (possibly) a young developing mind and body? But that is another topic.