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Legal status
Legal status
  • N-Phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]oxolane-2-carboxamide
CAS Number
PubChem CID
Chemical and physical data
Molar mass378.516 g·mol−1
3D model (JSmol)
  • InChI=1S/C24H30N2O2/c27-24(23-12-7-19-28-23)26(21-10-5-2-6-11-21)22-14-17-25(18-15-22)16-13-20-8-3-1-4-9-20/h1-6,8-11,22-23H,7,12-19H2

Tetrahydrofuranylfentanyl is an opioid analgesic that is an analog of fentanyl and has been sold online as a designer drug, first appearing in Europe in late 2016.[1][2]

Side effects[edit]

Side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. Fentanyl analogs have killed hundreds of people throughout Europe and the former Soviet republics since the most recent resurgence in use began in Estonia in the early 2000s, and novel derivatives continue to appear.[3] A new wave of fentanyl analogues and associated deaths began in around 2014 in the US, and have continued to grow in prevalence; especially since 2016 these drugs have been responsible for hundreds of overdose deaths every week.[4]

Legal status[edit]

Tetrahydrofuranylfentanyl was placed into Schedule I in the US in October 2017, in order to avoid an imminent hazard to public safety.[5]

See also[edit]


  1. ^ "EMCDDA–Europol Joint Report on a new psychoactive substance: N-phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]tetrahydrofuran-2-carboxamide (tetrahydrofuranylfentanyl; THF-F)". September 2017.
  2. ^ Kanamori, Tatsuyuki; Segawa, Hiroki; Yamamuro, Tadashi; Kuwayama, Kenji; Tsujikawa, Kenji; Iwata, Yuko T. (December 2019). "Metabolism of a new synthetic opioid tetrahydrofuranylfentanyl in fresh isolated human hepatocytes: Detection and confirmation of ring-opened metabolites". Drug Testing and Analysis. 12 (4): 439–448. doi:10.1002/dta.2743. ISSN 1942-7611. PMID 31797567. S2CID 208627099.
  3. ^ Mounteney J, Giraudon I, Denissov G, Griffiths P (July 2015). "Fentanyls: Are we missing the signs? Highly potent and on the rise in Europe". The International Journal on Drug Policy. 26 (7): 626–31. doi:10.1016/j.drugpo.2015.04.003. PMID 25976511.
  4. ^ Armenian P, Vo KT, Barr-Walker J, Lynch KL (October 2017). "Fentanyl, fentanyl analogs and novel synthetic opioids: A comprehensive review" (PDF). Neuropharmacology. 134 (Pt A): 121–132. doi:10.1016/j.neuropharm.2017.10.016. PMID 29042317. S2CID 21404877.
  5. ^ Drug Enforcement Administration, Department of Justice (October 2017). "Schedules of Controlled Substances: Temporary Placement of ortho-Fluorofentanyl, Tetrahydrofuranyl Fentanyl, and Methoxyacetyl Fentanyl Into Schedule I. Temporary amendment; temporary scheduling order". Federal Register. 82 (206): 49504–8. PMID 29091366.