Pharmacy/drug testing


Is there any possibility that diphenhydramine hcl show a positive on a ua drug test


A urine test is intended to show positive results for whatever drugs it was designed to test for. These could be tests for benzodiazepines, stimulants and opiates, but simple antihistamines would not normally be screened for unless there are suspicisions it is being misuesd.

If you have been taking the drug for justified medical purposes, and taking the recommnended doses, then my advise would to be open and honest with testers and if necessary use a blood test to confirm levels are not excessive. Witholding information only risks complicating matters and will be seen as deliberate. Being up front and saying what you have used will defuse the situation and show honesty.

I hope this helps.


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Nigel Simmons


I am happy to answer general questions on medicines and hospital care. If possible, please use approved / chemical names rather than brands which are not internationally recognised. Like all health professionals I am bound by a duty of care which prevents me giving detailed information about medication or treatment of people other than the questioner. I will endeavour to help wherever possible or point towards more appropriate advice. If however your question crosses too far into patient confidentiality, I hope you will understand why I cannot answer your question. Consider.. would you want me to discuss your care with a friend or relative without your knowledge?


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