Many non illicit drugs cross react with common drugs screened on the traditional urine drug screen.
- NSAIDs can cause false positive cannabinoid screens
- Sertraline can cause a benzo false positive
- Most benzodiazepine screens look for oxazepam which is a metabolite of diazepam and chlordiazepoxide. Therefore, lorazepam, alprazolam, and clonazepam are commonly missed.