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A member asked:
Can someone taking morphine sulfate test positive for fentanyl in a saliva drug test , although they have never taken fentanyl ever?
A doctor has provided 1 answer
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.
Answered 8/2/2014
3.9k views
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