4-Fluorobutyrfentanyl Stats & Data
History & Culture
4-Fluorobutyrfentanyl emerged as a designer drug sold online as part of the broader wave of synthetic opioid analogs appearing in illicit markets. Structurally, it is an analog of butyrfentanyl and is closely related to 4-fluorofentanyl, representing one of numerous modifications to the fentanyl scaffold explored by clandestine chemists. The compound is reportedly rare, and there is limited documentation regarding its origins, synthesis history, or the specific circumstances of its introduction to the recreational drug market. Like many novel synthetic opioids, it appears to have been developed and distributed primarily through online vendors catering to the research chemical market.
Effect Profile
Curated + 2 ReportsStrong euphoria with moderate itching/nausea, mild pain relief, low sedation
Tolerance & Pharmacokinetics
drugs.wikiTolerance Decay
Experience Report Analysis
ErowidDemographics
Gender Distribution
Age Distribution
Reports Over Time
Form / Preparation
Most common forms and preparations reported
Legal Status
| Country | Status | Notes |
|---|---|---|
| China | Controlled substance | Became a controlled substance in October 2015 as part of China's efforts to restrict synthetic opioid production and distribution. |
| Sweden | Hazardous substance (proposed) | Sweden's public health agency recommended classification as a hazardous substance on August 18, 2014. This designation restricts sale and possession under Swedish drug control legislation. |
| United States | Schedule I | Classified as a Schedule I controlled substance under federal law since February 1, 2018. This designation indicates high abuse potential with no accepted medical use. |