Fenethylline, once marketed as Captagon, is a prodrug that metabolizes into amphetamine and theophylline. Authentic material carries classic stimulant risks and high addiction potential, while most modern 'Captagon' tablets are counterfeit mixtures. Illicit 'captagon' tablets in MENA regions typically contain amphetamine, caffeine, and fillers rather than genuine fenethylline; dosage guidance here assumes laboratory-verified fenethylline. Rapid parent compound clearance (t½ ≈1.3 hours) is followed by sustained activity of metabolites (amphetamine t½ ≈12-15 hours). Original pharmaceutical formulation was 50 mg tablets.
Fenethylin molecular structure diagram from the DrugsPRO substance library.
Also known as: Fitton, Captagon, Biocapton, Amfetyline, Phenethylline, Fenetylline, Fenetyllinum, Ethyltheophylline-amphetamine codrug
Classification
Chemical: Amphetamine
Chemical: Xanthine
Psychoactive: Stimulant
Tag: Habit-Forming
Tag: Research-Chemical
Tag: Substituted amphetamine
Effects
Stimulation
Increased Heart Rate
Abnormal Heartbeat
Increased Blood Pressure
Bronchodilation
Dry Mouth
Euphoria
Wakefulness
Mental Clarity
Increased Focus
Increased Sociability
Anxiety
Appetite Suppression
Light Sensitivity
Increased Libido
Dehydration
Disinhibition
Increased Music Appreciation
Routes of Administration
Oral
Dosage
Threshold: 25 mg
Light: 25-75 mg
Common: 75-150 mg
Strong: 150-250 mg
Heavy: 250 mg+
Duration
Onset: 1.5-2 h
Comeup: 0.5-1 h
Peak: 1-4 h
Offset: 4-8 h
After Effects: 2-12 h
Total Duration: 6-10 h
Insufflated
Dosage
Threshold: 10 mg
Light: 10-40 mg
Common: 40-80 mg
Strong: 80-120 mg
Heavy: 120 mg+
Duration
Onset: 0.08-0.25 h
Comeup: 0.25-0.5 h
Peak: 1-3 h
Offset: 3-6 h
After Effects: 2-12 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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Fenethylline - DrugsPRO průvodce látkou
Fenethylline: Fenethylline, once marketed as Captagon, is a prodrug that metabolizes into amphetamine and theophylline. Authentic material carries classic stimulant risks and high addiction potential, while most modern 'Captagon' tablets are counterfeit mixtures. Illicit 'captagon' tablets in MENA r
