That is because the Propoxiphine does have Tylenol in it and it has alot of the same properties as well. They are both similar but yet they are different. It is definately going to show up though because of the similarities. Hope this helps you understand more if not let me know and I will try to explain better.
I wouldnt say its IMPOSSIBLE, but it wouldnt make any sense if it did. diphenhydramine is the 'PM part' of tylenol pm (diphenhydramine is benadryl) while propaxephine is an opioid. HOWEVER, Dextromethorphan (active ingredient in alot of otc cough syrups) could cause you to test positive for it.
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