Fentanyl-13C6 (hydrochloride) (CRM) (Item No. 26315) is a certified reference material intended for use as an internal standard for the quantification of fentanyl (Item Nos. ISO60197 | 14719 | 22659) by GC- or LC-MS. Fentanyl is categorized as an opioid.1,2 It is more effective than morphine (Item Nos. ISO60147 | 15464) at reducing pain but is also more lethal.3 Fentanyl is highly abused and is associated with many fatal overdoses.4. Fentanyl is regulated as a Schedule II compound in the United States. Fentanyl-13C6 (hydrochloride) (CRM) (Item No. 26315) is provided as a DEA exempt preparation. This product is intended for research and forensic applications.WARNING This product is not for human or veterinary use.