ArticleCase reports in psychiatry2023
False Positive Tramadol Urine Testing in Patients Taking Fexofenadine: A Tale of Two Consecutive Cases.
Article in Case reports in psychiatry, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
2 citing papers in PubMed, 1 citations in OpenAlex.
- Interpol review of forensic drug chemistry, 2022-2025.Forensic science international. Synergy · 2026Review
- Azathioprine and hydroxychloroquine overdose in Sjögren's syndrome patient with hypocalcemia: a case report.Journal of medical case reports · 2024Article
Corrections and comments
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Urine drug screen immunoassays have been widely used as point-of-care testing for detection of various drug classes in substance use disorders. However, these immunoassays frequently result in false positive results. We report two patients that used 180 mg daily dose of fexofenadine hydrochloride for treatment of skin allergy and, falsely, tested positive for use of tramadol during urine drug screening. We recommend caution when interpreting positive tramadol urine screening among patients on fexofenadine treatment.
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Registered trials
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