Methyl-K
Limited data
Limited data
Sparse data. Doses and effects may be unreliable or untested.
- 1 source
- duration data present
- 18 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
- 1 source
- duration data present
- 18 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
Aliases: Mbdp, Uwa-091
Summary
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.
Perspectives
“There were no effects. I was busy and totally wound up and didn’t sleep until 3 a.m., but this was probably unrelated to the Me-K.”
Dose Information
| ROA | Threshold |
|---|---|
| Oral | 75mg |
| Insufflated | 40mg |
| Rectal | 40mg |
| Vaporized / Smoked | 5mg |
Only a threshold dose is documented for this substance — the smallest amount with a noticeable effect. There is no published light/common/strong ladder to show above it.
Onset, Duration & After-effects
| ROA | Onset | Peak | Offset | Total |
|---|---|---|---|---|
| Oral | 30-60 min | 1-3 hrs | 2-3 hrs | 3.5-7 hrs |
| Insufflated | 5-15 min | 1-3 hrs | 2-3 hrs | 3.08-6.25 hrs |
| Rectal | - | 1-3 hrs | 2-3 hrs | 3-6 hrs |
| Vaporized / Smoked | 1-3 min | 1-3 hrs | 2-3 hrs | 3.02-6.05 hrs |
Effect Profile
Scores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Moderate stimulation and sensory enhancement with mild empathy, low euphoria
Strong anxiety/jitters with moderate stimulation, low euphoria and focus
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Methyl-K Source: SubstanceSearch (substancesearch.com) Oral dose (mg): threshold 75 Insufflated dose (mg): threshold 40 Rectal dose (mg): threshold 40 Vaporized / Smoked dose (mg): threshold 5 Oral duration: onset 0.5-1h · peak 1-3h · offset 2-3h · total 3.5-7h · after-effects 2-12h Insufflated duration: onset 5-15m · peak 1-3h · offset 2-3h · total 3.08-6.25h · after-effects 2-12h Rectal duration: peak 1-3h · offset 2-3h · total 3-6h · after-effects 2-12h Vaporized / Smoked duration: onset 1-3m · peak 1-3h · offset 2-3h · total 3.02-6.05h · after-effects 2-12h Note: ranges are harm-reduction guidance, not a prescription. Start low, go slow, and test your substances.
The app keeps custom substances simple, so the full dose ranges live in the description text above. Ranges are harm-reduction guidance, not a prescription.
Tolerance
Tolerance Decay
Acute tolerance: develops within a single session — the reset numbers above apply after sustained heavy use, not after one binge. Within-session tachyphylaxis usually resets largely overnight.
Cross-Tolerances
Effects
- Clean Mental Stimulation
- Stimulation
- Jaw Clenching
- Tachycardia
- Insomnia
- Post-use Fatigue
- Teeth grinding
- Increased heart rate
- Pupil dilation
- Vasoconstriction
- Subtle Empathogenic Warmth
- Mild Euphoria
- Increased Sociability
- Alertness enhancement
- Euphoria
- Wakefulness
- Anxiety
- Talkativeness
- Thought acceleration
- Time distortion
- Increased music appreciation
- Tactile enhancement
- Increased libido
- Tracers
- Color enhancement
- Pattern recognition enhancement
- Light sensitivity
- Dehydration
- Appetite suppression
- Disinhibition
Combinations
Cross-Check Methyl-K with another substancePiHKAL / TiHKAL
“There were no effects. I was busy and totally wound up and didn’t sleep until 3 a.m., but this was probably unrelated to the Me-K.”
Helpful Links
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