Answer
Venlafaxine can cause false-positive urine immunoassay screening results for phencyclidine (PCP) and amphetamine, potentially persisting for several days after discontinuation; confirmatory tests such as gas chromatography/mass spectrometry distinguish venlafaxine from these drugs.
Sources for this answer
- Efexor XL 75 mg hard prolonged release capsulesViatris (formerly Mylan or Upjohn) · emc · SmPC §4.4 Special warnings and precautions for use · Version 43Document updated
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