What type of substance is likely associated with false positives for Phencyclidine (PCP) in urine tests?

Dextromethorphan is a common over-the-counter cough suppressant that can lead to false positives for Phencyclidine (PCP) in urine drug screening tests. This occurs because dextromethorphan and PCP share similar metabolic pathways and can produce cross-reactivity in immunoassay tests designed to detect substances in the urine.

In contrast, while bupropion, sertraline, and propranolol are all substances that may introduce other effects on a drug screening, they do not typically produce cross-reactivity that would lead to false positives specifically for PCP. Understanding this distinction is important in the context of interpreting urine drug tests accurately, especially in medical settings where treatment and management plans are influenced by these test results.