Library
Metyl-K
Data are extremely scarce: only one formal PiHKAL trial (100 mg oral produced no overt effects) and a handful of 2025 forum / Reddit self-experiments. Community consensus places active oral dosing somewhere in the low-hundreds of milligrams, broadly mirroring its ethyl homologue MBDB but requiring approximately 25-40% higher weight due to weaker serotonin release. Bluelight users describe mild 'wired but clear' stimulation, elevated heart-rate (90-110 bpm resting) and difficulty sleeping for over 8 hours after 200 mg or more. One vaper reported light euphoria, body warmth and jaw tension after 20-30 mg total free-base inhaled across an evening. Structure-activity discussion suggests Methyl-K behaves primarily as a dopamine reuptake inhibitor with limited oral bioavailability, explaining higher effective doses and the preference for intranasal / rectal routes to improve efficiency.
Also known as: Mbdp, Uwa-091
Classification
- Chemical: Amphetamine
- Chemical: Phenethylamine
- Psychoactive: Entactogen
- Psychoactive: Stimulant
- Tag: Research-Chemical
Effects
- Clean Mental Stimulation
- Jaw Clenching
- Tachycardia
- Insomnia
- Postuse Fatigue
- Stimulation
- Subtle Empathogenic Warmth
- Mild Euphoria
- Increased Sociability
- Talkativeness
- Alertness Enhancement
- Anxiety
- Light Sensitivity
Routes of Administration
Oral
Dosage
- Threshold: 75 mg
- Light: 75-150 mg
- Common: 150-250 mg
- Strong: 250-350 mg
- Heavy: 350 mg
Duration
- Onset: 0.5-1 h
- Peak: 1-3 h
- Offset: 2-3 h
- After Effects: 2-12 h
Insufflated
Dosage
- Threshold: 40 mg
- Light: 40-80 mg
- Common: 80-150 mg
- Strong: 150-250 mg
- Heavy: 250 mg
Duration
- Onset: 0.08-0.25 h
- Peak: 1-3 h
- Offset: 2-3 h
- After Effects: 2-12 h
Rectal
Dosage
- Threshold: 40 mg
- Light: 40-90 mg
- Common: 90-180 mg
- Strong: 180-300 mg
- Heavy: 300 mg
Duration
- Peak: 1-3 h
- Offset: 2-3 h
- After Effects: 2-12 h
Vaporized / Smoked
Dosage
- Threshold: 5 mg
- Light: 5-15 mg
- Common: 15-30 mg
- Strong: 30-60 mg
- Heavy: 60 mg
Duration
- Onset: 0.02-0.05 h
- Peak: 1-3 h
- Offset: 2-3 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.
Links
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