15mg vaporization 4-HO-MPT (freebase) T 0:00:00 Substance vaporized in glass over steel wool. T 0:00:05 Initial effects noted, coming strongly T 0:00:10 Becoming saturated in the material, closing eyes and anticipating what more is to come T 0:00:20 Feeling a dissolving, breakthrough experience.
4-HO-MPT
Encyclopedic
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 4 corroborating sources
- 2 ROAs with full dose ladders
- duration data present
- 18 combo interactions documented
- PubChem toxicity data
- classified Tentative
- classified Research-chemical
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 4 corroborating sources
- 2 ROAs with full dose ladders
- duration data present
- 18 combo interactions documented
- PubChem toxicity data
- classified Tentative
- classified Research-chemical
Aliases: 4hompt
Summary
4-Hydroxy-N-methyl-N-propyltryptamine (also known as 4-HO-MPT or Meprocin) is a novel synthetic psychedelic substance of the tryptamine chemical class that produces psychedelic effects when administered. It is a closely related structural analog of 4-HO-DMT (Psilocin) and other hallucinogenic tryptamines with powerful psychedelic effects.
Perspectives
“There was a very mild visual distortion, and a prominent vertigo without nausea. In the second hour there is still some enhancement of visual detail, but I am not endowed with the flight of ideas of philosophical concepts as with psilocin. I am rapidly subsiding and I am able to eat normally. Residual insomnia lasted eight hours.”
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 10-20mg | 20-30mg | 30-50mg | 50mg+ |
| Vapourized | 3-5mg | 5-10mg | 10-15mg | 15mg+ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset |
|---|---|---|---|---|
| Oral | 18-60 min | 1-2 hrs | 2-3 hrs | 1-2 hrs |
| Vapourized | 1 min | - | 45-90 hrs | - |
Effect Profile
6 reportsScores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Psychedelic
7.0
Strong+
7/10
Strong visuals and auditory effects with mild headspace and body load
Visual Intensity
×3
10
color enhancement
tracers
drifting
pattern recognition enhancement
color shifting
depth perception distortions
+2 more
Headspace Depth
×3
4
conceptual thinking
personal bias suppression
time distortion
Auditory Effects
×1
8
auditory distortion
auditory hallucination
Body Load / Somatic Effects
×1
4
nausea
increased heart rate
Based on reports from:
Tolerance
Build-up
develops rapidly after a single use
Reset
7–14 days for baseline
Tolerance Decay
Full tolerance
1h
Half tolerance
10d
Baseline
~14d
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.
Effects
Aggregated from 6 Erowid experience reports
Positive Effects 6
Euphoria
83.3%
70%
Music Enhancement
66.7%
70%
Color Enhancement
50.0%
70%
Empathy
50.0%
70%
Stimulation
50.0%
70%
Tactile Enhancement
50.0%
70%
Adverse Effects 2
Anxiety
50.0%
70%
Confusion
50.0%
70%
Combinations
Cross-Check 4-HO-MPT with another substanceCommunity Trip Reports
Anecdotal first-person accounts from Reddit, Erowid, and Bluelight. Click a source to expand. Reports are harm-reduction context, not medical guidance.
Erowid 4 reports 1 positive 3 neutral visit
Well, I had hoped to keep some time log during this experience as I did my last one, but the nature of the trip prevented that sort of basic functioning from really being workable. Instead, I will just have to recall the events from memory as best I can.
T+0.00: 16 mg 4-HO-MPT Freebase Age: 18 Weight: 128 lbs Gender: Male Prior substance use: Started doing drugs 8 months ago. Marijuana, Alcohol, Kratom, Nitrous, Shrooms, DMT, Salvia, Vicodin, Acid (likely not LSD), 4-Aco-DMT, Ketamine. I had smoked marijuana last night.
Prior drug experiences: DMT, DPT, 4-HO-DiPT, MET, 4-AcO-DMT, LSD, 2C-B, 2C-D, psilocybin mushrooms, salvia divinorum, methamphetamine, amphetamine, 4-FA, methylone, MDMA, cocaine, cannabis, opium, opiates, etc.
Bluelight Reference Guide
Tryptamines The Big & Dandy 4-HO-MPT Thread
Anyone have any experience at all with this material? TIHKAL notes of only one experience at 8mg in which There was a very mild visual distortion, and a prominent vertigo without nausea.
Read full thread on Bluelight →PiHKAL / TiHKAL
TiHKAL #23: 4-HO-MPT
“There was a very mild visual distortion, and a prominent vertigo without nausea. In the second hour there is still some enhancement of visual detail, but I am not endowed with the flight of ideas of philosophical concepts as with psilocin. I am rapidly subsiding and I am able to eat normally. Residual insomnia lasted eight hours.”
4-HO-MPT's nerd page
Pharmacology, chemical data, effect profiles, and more
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