3F-PiHP is a fluorinated pyrrolidinophenone cathinone structurally related to α-PiHP, α-PHP, and 3F-PVP. It produces forceful stimulation, sociability, and euphoria but also frequent anxiety, paranoia, and powerful redosing compulsions, especially when vaped or insufflated. First identified in Sweden and Finland in mid-2019; limited pharmacological and toxicological data exist. User reports characterize it as a 'diet' α-PiHP with milder rush but similar compulsive redosing tendencies and harsh airway irritation when vaporized. Acetone washing or diluting with 70/30 VG/PG e-liquid can reduce throat burn.
Also known as: 3F-PiHP, 3f-α-pihp, 3F-Alpha-PHIP, 3F-PHIP
Classification
Chemical: Cathinone
Psychoactive: Stimulant
Tag: Pyrrolidine
Tag: Research-Chemical
Effects
Stimulation
Physical Euphoria
Vasoconstriction
Teeth Grinding
Bodily Tremor
Increased Heart Rate
Cognitive Euphoria
Focus Enhancement
Motivation Enhancement
Thought Acceleration
Compulsive Redosing
Anxiety
Appetite Suppression
Dehydration
Disinhibition
Light Sensitivity
Tactile Enhancement
Increased Libido
Routes of Administration
Vaporized / Smoked (Freebase)
Dosage
Threshold: 5-10 mg
Light: 10-25 mg
Common: 25-50 mg
Strong: 50-80 mg
Heavy: 80 mg
Duration
Onset: 0-0 h
Comeup: 0.02-0.05 h
Peak: 0.25-1 h
Offset: 1-2 h
After Effects: 2-6 h
Insufflated
Dosage
Threshold: 3-5 mg
Light: 5-10 mg
Common: 10-25 mg
Strong: 25-40 mg
Heavy: 40+ mg
Duration
Onset: 0.08-0.25 h
Comeup: 0.08-0.17 h
Peak: 0.25-1 h
Offset: 1-2 h
After Effects: 2-6 h
Total Duration: 2-4 h
Oral
Dosage
Threshold: 15 mg
Light: 15-30 mg
Common: 30-60 mg
Strong: 60-90 mg
Heavy: 90+ mg
Duration
Onset: 0.33-0.67 h
Comeup: 0.33-0.5 h
Peak: 0.75-2 h
Offset: 1-2 h
After Effects: 2-6 h
Total Duration: 3-6 h
Smoked
Dosage
Heavy: 80+ mg
Light: 10–25 mg
Common: 25–50 mg
Strong: 50–80 mg
Threshold: 5–10 mg
Duration
Onset: 0.01-0.1 h
Peak: 0.1-0.5 h
Offset: 0.5-1.5 h
After Effects: 2-6 h
Total Duration: 1.5-2.5 h
Harm Reduction
Check interactions before mixing substances, pay attention to dose spacing and hydration, and treat all dosage guidance as approximate rather than guaranteed safe.
Sources
Substance data is aggregated from the following public harm-reduction and reference sources.
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3-Fluoro-alpha-PiHP - DrugsPRO průvodce látkou
3-Fluoro-alpha-PiHP: 3F-PiHP is a fluorinated pyrrolidinophenone cathinone structurally related to α-PiHP, α-PHP, and 3F-PVP. It produces forceful stimulation, sociability, and euphoria but also frequent anxiety, paranoia, and powerful redosing compulsions, especially when vaped or insufflated. Firs
