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Midland, PA
A 53-year-old female asked:

can someone taking morphine sulfate test positive for fentanyl in a saliva drug test , although they have never taken fentanyl ever?

1 doctor answer7 doctors weighed in
Dr. Paul Grin
Dr. Paul Grin answered
Pain Management 36 years experience
Yes,: Both drugs in the same class (opioids) so they will both show up the same. Fentanyl is a synthetic opioid and much stronger than morphine. When testing for Morphine, it will show positive for morphine metabolites or fentanyl. Take care.

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Last updated Aug 2, 2014
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