TABLE 6.
Substances Tested by Immunoassay and Agents Contributing to False-Positive Results
| Substances Tested by Immunoassay | Positive Results (Brand Name) |
|---|---|
| Amphetamine and methamphetamine | Amantadine |
| Bupropion | |
| Chlorpromazine | |
| Desipramine | |
| Ephedrine | |
| Labetalol | |
| l-methamphetamine (Vick's inhaler) | |
| Phentermine | |
| Phenylephrine | |
| Promethazine | |
| Pseudoephedrine | |
| Ranitidine | |
| Selegiline | |
| Trazodone | |
|
| |
| Benzodiazepines | Oxaprozin |
| Sertraline | |
| Efavirenz | |
|
| |
| Methadone | Quetiapine |
| Verapamil | |
|
| |
| Marijuana metabolites | Dronabinol (Marinol) |
| Efavirenz | |
| Hemp-containing foods | |
| NSAIDs | |
| PPIs | |
|
| |
| Opiates | Dextromethorphan |
| Diphenhydramine | |
| Poppy seeds | |
| Quinine | |
| Quinolones | |
| Rifampin | |
| Verapamil | |
|
| |
| Phencyclidine | Dextromethorphan |
| Diphenhydramine | |
| Doxylamine | |
| Ibuprofen | |
| Imipramine | |
| Meperidine | |
| Thioridazine | |
| Tramadol | |
| Venlafaxine | |
| O-desmethylvenlafaxine (Pristiq) | |
Abbreviations: NSAID, nonsteriodal anti-inflammatory drugs; PPIs, protein pump inhibitors.