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Can Nyquil or Benadryl cause a false positive for methadone?

Responses (2)

Inactive 25 May 2011

Hey Mmc,

The following lists some of the common medicine/conditions that can cause a false positive for opiates:

You will see that Nyquil can cause a false positive for opiates as well as amphetamines.

Hope this helps,


suzanne66 25 May 2011

Yes, the dextromethorphan in Nyquil and the diphenhydramine in Benadryl could both give false positives for Methadone free discount card

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