Tetrahydrofuran-Fentanyl
Aliases: Thf-f, thff
Summary
An analogue of fentanyl that is unknown in literature. Is most likely less potent than most other analogues. Yet very few reports are around.
Effect Profile
Scores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Opioid
5.4
Moderate+
5/10
Strong euphoria with mild sedation and itching/nausea
Euphoria / Warmth
×3
9
physical euphoria
cognitive euphoria
euphoria
Analgesia
×2
0
Sedation / Relaxation
×1
5
sedation
muscle relaxation
Itching / Nausea
×1
4
nausea
Based on reports from:
Tolerance
Build-up
develops within days of regular use; analgesic tolerance faster than respiratory depression tolerance
Reset
7–14 days for partial reset; full reset may take weeks — tolerance loss greatly increases overdose risk
Tolerance Decay
Full tolerance
1d
Half tolerance
21d
Baseline
~35d
Effects
Positive
- Stimulation
- Physical euphoria
- Muscle relaxation
Negative
- Motor impairment
- Increased heart rate
- Nausea
- Vasoconstriction
- Respiratory depression
- Teeth grinding
- Sedation
Positive
- Reduced anxiety
- Cognitive euphoria
- Euphoria
- Anxiety suppression
- Wakefulness
Negative
- Anxiety
- Compulsive redosing
- Dizziness
- Thought deceleration
- Time distortion
Positive
- Increased music appreciation
- Increased libido
- Tactile enhancement
- Color enhancement
Negative
- Disinhibition
- Appetite suppression
- Dehydration
- Light sensitivity
- Double vision
- Dulled perception
Combinations
Tetrahydrofuran-Fentanyl's nerd page
Pharmacology, chemical data, effect profiles, and more
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