Summary
Furanylfentanyl (Fu-F) is a potent ฮผ-opioid full agonist approximately 50-100 times more potent than morphine and roughly half as potent as fentanyl. U.S. and EU regulators placed it in Schedule I after at least 23 confirmed deaths in Europe alone by 2017. It exhibits rapid-onset but short-lived euphoria and profound respiratory depression. Mass-overdose clusters have occurred when it adulterated heroin, cocaine, or counterfeit tablets.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Insufflated | 200-400ug | 400-800ug | 800-1600ug | 1600ug+ |
| Oral | 300-500ug | 500-900ug | 900-1600ug+ | 1600ug++ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Peak | Offset | After Effects | Total |
|---|---|---|---|---|---|
| Insufflated | 1-5 min | 15-30 min | 1-2 hrs | 1-2 hrs | 60-0 min |
| Oral | 1-10 min | 1.0-3.0 hrs | - | 1.0-3.0 hrs | 60-0 min |
Tolerance
Build-up
develops within days of regular use; analgesic tolerance faster than respiratory depression tolerance
Reset
7โ14 days for partial reset; full reset may take weeks โ tolerance loss greatly increases overdose risk
Effects
Positive
- Analgesia
- Physical euphoria
- Pain relief
Negative
- Respiratory depression
- Itching
- Nausea
- Sedation
- Pupil constriction
- Nodding
- Itchiness
Positive
- Cognitive euphoria
- Reduced anxiety
- Anxiety suppression
- Euphoria
- Mood lift
Negative
- Compulsive redosing
- Constipation
- Dizziness
- Motor control loss
- Physical autonomy
Positive
- Warmth
- Color enhancement
- Increased music appreciation
- Brightened colour
Negative
- Light sensitivity
- Appetite suppression
- Disinhibition
- Dehydration
- Dulled perception
- Drifting