Opioid false-positivity in urine drug screening: levomepromazine cross-reactivity

ABSTRACT

Urine drug screening false-positives are reported for several drugs, which may lead to clinical misdiagnosis and have negative consequences for the patient on personal and social grounds, if not identified. False-positives for opiates are rare, but we report a case where high-dose levomepromazine was very likely involved.

KEYWORDS:

• False-positives
• cross-reactivity
• opioids
• levomepromazine
• urine drug screening