Table 1.
Detection time windows and false positives for commonly used substances.
| Drug | Detection Time (Urine) | False Positives |
|---|---|---|
| Alcohol | ||
| - Ethanol | Less than 12 h | No |
| - Ethyl glucuronide (metabolite) | 5 days | No |
| Amphetamine/Methamphetamine | 2–3 days | Amantadine, bupropion, chlorpromazine, desipramine, fluoxetine, labetalol, methylphenidate, phentermine, phenylephrine, phenylpropanolamine, promethazine, pseudoephedrine, ranitidine, thioridazine, trazodone |
| Cocaine | Topical anesthetics containing cocaine | |
| - Occasional use | 2–3 days | |
| - Heavy use | Up to 8 days | |
| Cannabis | Dronabinol, ibuprofen, naproxen, sulindac, proton pump inhibitors | |
| - Single use | 3 days | |
| - Less than daily | Up to 1 week | |
| - Daily | 1 to 2 weeks | |
| - Daily, heavy use | >30 days | |
| Opioids | Dextromethorphan, diphenhydramine, fluoroquinolones, poppy seeds, quinine, rifampin, verapamil (methadone assays only) | |
| - Codeine | 2 days | |
| - Heroin (morphine) | 2 days | |
| - Hydromorphone | 2–4 days | |
| - Methadone | 3 days | |
| - Morphine | 2–3 days | |
| - Oxycodone | 2–4 days | |
| Tobacco | Up to 1 week | Nicotine replacement therapy, nicotine vaporizers |