Quetiapine cross reactivity with urine methadone immunoassays.

摘要

To the Editor: Drug screening through urinalysis is a widely accepted method for rapid detection of potential drug use at a relatively low cost. On the other hand, interferences are not that unusual in these kinds of kit assays because of similarities in compound chemical structures and the often nonspecific ways in which the compounds are detected.We report a case of three schizophrenia patients with quetiapine monotherapy who underwent urine drug screens in the context of a functional magnetic resonance imaging (fMRI) study. At the time of investigation, the patients did not take other drugs.