What common substance can produce a false positive for amphetamines on a urine drug screen?

Stimulants, particularly those that are structurally similar to amphetamines, can produce a false positive on a urine drug screen for amphetamines. Medications such as certain weight loss drugs and medications for ADHD that fall into the category of stimulant drugs can result in test results that indicate the presence of amphetamines due to their chemical similarities or cross-reactivity in the assay used for the screening.

Urine drug screens often use immunoassays that can detect a range of substances, and these assays sometimes have difficulty distinguishing between different classes of drugs that have similar structures. This is why an individual taking a prescribed stimulant for a legitimate medical condition might show positive results for amphetamines, despite not having used them illicitly.

The other options, while they may have their own test characteristics, do not typically lead to false positives for amphetamines in the same way that stimulants do, making stimulants the significant focus here.