4-HO-McPT - Substance Search

Summary TheDrug.Wiki TripSit

4-HO-MPT is a research chemical with very little history of human usage and minimal scientific data on its pharmacology, metabolism, and toxicity. Legal status varies by jurisdiction; it is unscheduled in most countries but is a Class A drug in the United Kingdom under the tryptamine catch-all clause and controlled under Germany's NpSG. Use precise scales for dosing as potency varies between salt forms (freebase is approximately 25% more potent than fumarate salts).

Dose Information TheDrug.Wiki

Light Common Strong Heavy

Onset, Duration & After-effects TheDrug.Wiki

ROA	Onset	Comeup	Peak	Offset	After Effects
Oral	19-40 min	30-60 min	2-3 hrs	1-2 hrs	1-3 hrs
Insufflated	4-15 min	15-30 min	45-90 min	30-60 min	1-2 hrs

Effect Profile

5 reports

Scores (1–10) curated from multiple sources:

Effect keyword matching from PsychonautWiki catalog
Weighted by importance: core (×3), major (×2), minor (×1)

Full methodology

Psychedelic 7.1

Strong+ 7/10

Strong visuals and auditory effects with moderate headspace and body load

Visual Intensity ×3

9

color enhancement drifting pattern recognition enhancement color shifting depth perception distortions after images

Headspace Depth ×3

6

thought connectivity emotion enhancement thought loops time distortion

Auditory Effects ×1

8

music enhancement auditory distortion

⚠ Body Load / Somatic Effects ×1

6

nausea bodily pressures increased heart rate

Based on reports from:

Bluelight Big & Dandy Thread Erowid Experience Reports PsychonautWiki 4-HO-McPT

Tolerance

Build-up develops rapidly after a single use

Reset 7–14 days for baseline

Tolerance Decay

Full tolerance 1d Half tolerance 3d Baseline ~7d

Pattern extrapolated from classical psychedelic tolerance: marked within 24 h, decreases substantially by 3–4 days, and approximates baseline after ~7–14 days. Data are indirect and rely on broader psychedelic literature and user reports rather than 4-HO-McPT-specific studies.