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Year when each NPFD was first reported to NPSAD
| 2015 | 2016 | 2017 |
|---|---|---|
| Acetylfentanyl | 2‐Fluorofentanyl | Butyrfentanyl |
| Para‐Fluorobutyrfentanyla | 4‐Fluorofentanyl | Cyclopropylfentanyl |
| Carfentanyl | Despropionylfentanyl | |
| Furanylfentanyl | ||
| Methoxyacetylfentanyl | ||
| Ocfentanyl |
Para‐fluorobutyrfentanyl was also reported using its alternate name fluorobutryrylfentanyl: for analysis these cases have been merged and classified under the para‐fluorobutyrfentanyl term.
