4F-PHP
Aliases: 4-fluoro-alpha-php, 4-fluoro-pyrrolidinohexanophenone
Categories
Summary
4F-PHP is a potent synthetic stimulant in the pyrrolidinophenone/cathinone class, structurally related to alpha-PHP with a fluorine substitution at the 4-position of the phenyl ring. First identified in 2017, it produces strong stimulation and euphoria with high compulsivity. User reports suggest it is slightly less prone to extreme side effects than alpha-PVP but still carries significant risks including cardiovascular strain, anxiety, paranoia, and stimulant psychosis. Limited clinical data exists. Harm reduction practices are essential, including accurate dosing with a milligram scale, avoiding prolonged binges, and maintaining hydration.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Insufflated | 5-15mg | 15-30mg | 30-50mg | 50mg+ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset | After Effects | Total |
|---|---|---|---|---|---|---|
| Oral | 10-30 min | 20-40 min | 1-3 hrs | 2-4 hrs | 4-24 hrs | 180-0 min |
| Insufflated | 2-10 min | 10-20 min | 1-2 hrs | 1-3 hrs | 4-24 hrs | 180-0 min |
| Vaporized | 1-5 min | 5-10 min | 15-45 min | 30-90 min | 2-12 hrs | 180-0 min |
Tolerance
Build-up
develops over days to weeks of regular use
Reset
3–7 days for acute; 1–3 weeks for full reset
Effects
Positive
- Stimulation
- Physical euphoria
Negative
- Increased heart rate
- Increased perspiration
- Teeth grinding
- Insomnia
- Vasoconstriction
- Increased blood pressure
- Sweating
- Temperature regulation suppression
Positive
- Euphoria
- Cognitive euphoria
- Focus enhancement
- Motivation enhancement
Negative
- Compulsive redosing
- Anxiety
- Paranoia
- Ego inflation
- Thought acceleration
- Time distortion
Positive
- Increased libido
- Tactile enhancement
- Increased music appreciation
Negative
- Disinhibition
- Appetite suppression
- Light sensitivity
- Dehydration
- Appetite Suppression
- Vibrating vision
- Increase sexuality