bk-2C-B Well-documented

Well-documented

Multiple authoritative sources agree on dosing and effects.

4 corroborating sources

1 ROA with full dose ladder

duration data present

28 combo interactions documented

toxicity data (PsychonautWiki)

classified Research-chemical

Aliases: bk-2cb, bk-2-cb, b-k-2cb, b-k2cb, b-k2-cb, b-k2-c-b, b-k-2-c-b, bk2cb, βk-2C-B

Summary PsychonautWiki

βk-2C-B (also known as Bk-2C-B, or beta-keto 2C-B) is a novel psychedelic substance of the phenethylamine class. It is a structural analog of 2C-B.

Dose Information PsychonautWiki

ROA	Light	Common	Strong	Heavy
Oral	60-80mg	80-100mg	100-150mg	150mg+

Light Common Strong Heavy

Sources

Oral

Dose ladder — PsychonautWiki

Onset, Duration & After-effects TripSit PsychonautWiki

ROA	Onset	After Effects	Total
Oral	18-72 min	1-12 hrs	8-12 hrs

Effect Profile

9 reports

Scores (0–10) curated from multiple sources:

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

Full methodology

Psychedelic 4.6

Moderate+ 5/10

Strong visuals with mild auditory effects and body load, low headspace

Visual Intensity ×3

color enhancement tracers drifting brightened colour visual distortions

Headspace Depth ×3

confusion

Auditory Effects ×1

auditory distortion

⚠ Body Load / Somatic Effects ×1

nausea muscle tension

Based on reports from:

Bluelight Big & Dandy Thread Erowid Experience Reports PsychonautWiki bk-2C-B The Drug Users Bible bk-2C-B

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

Effects Erowid

Aggregated from 9 single-substance Erowid experience reports; 22 Erowid reports where another drug was taken too are left out

Each bar shows the share of analyzed reports whose text mentions that effect — a mention is not always a first-hand experience (fear of an effect or something witnessed can count). Mentions saying the effect did not happen are left out; that check reads keywords, so it can miss some. The shaded band on a bar, and the small range after its number, is the 95% interval: where the share could plausibly be with other reports of the same kind. Fewer reports, wider band. Tap or hover any number for details. The second value is the Bluelight extractor's per-effect confidence; a dash means the row is Erowid-derived, which has no confidence measurement.

Too few reports for bars: these effects come from 9 single-substance Erowid reports, and a bar is drawn only from 20 reports or more. With fewer, a percentage cannot tell a common effect from a rare one. Counts are shown instead. Why 20?

Positive Effects 9

7 of 9 –

5 of 9 –

4 of 9 –

3 of 9 –

Adverse Effects 5

6 of 9 –

5 of 9 –

4 of 9 –

3 of 9 –

Also reported in combinations. In the 22 bk-2C-B reports where another drug was taken too, 4 (18.2%) mention hospital, emergency services or an overdose, 1 (4.5%) a seizure and 2 (9.1%) psychosis. In the 9 single-substance reports: 2, 1 and 0. These are not in the figures above: they cannot be put down to bk-2C-B alone, and a mention is not always something that happened to the writer.

Combinations TripSit

Cross-Check bk-2C-B with another substance

Community Trip Reports

Anecdotal first-person accounts from Reddit, Erowid, Bluelight, and Dose.wiki. Click a source to expand. Reports are harm-reduction context, not medical guidance. Tags summarise each author's own verdict — how reports are classified.

Erowid 8 reports 5 positive 3 cautionary visit

A Profound Experience positive exp #102190

Having previously experienced this compound at an oral dosage of 130mg, I had been left somehow underwhelmed. A slight entactogenesis, enrichment in sound, taste, and smell, somehow brighter colours, minimal patterning on the pavement was all there had been.

A Magical Experience positive exp #105102

Hello, I thought I'd write this trip report because I haven't seen a whole lot of information on this amazing chemical bk-2C-B. I have a lot of experience with countless tryptamines, phenylthylamines, just about anything minus the retarded shit such as huffing gasoline hahaha.

I Saved a Piece of Pasta and Named It Freddy cautionary exp #105075

This happened a couple weeks ago, on a Sunday. First of all, I didn't have a scale so I eyeballed all doses and parachuted them in a rolling paper. Here is what I think I took : 11:00AM : 60mg - Felt no effects 12:00AM : 40mg - Felt no effects 14:00PM : 50mg - Felt nothing until 6PM.

My 40-Hour Trip cautionary exp #106649

Bare in mind this post documents the past 2 days of my life and is almost definitely going to be long. This is my report on an insane trip I've had over the past 2 days on a substance called BK-2CB- a legal analogue of the once popular 2CB.

A New Frontier positive exp #103512

I have vast experience with psilocybin mushrooms, metocin, cannabis, LSD, methoxetamine, kratom, all sorts of pharmaceuticals, 2C-B, MDMA, DMT, and 5-MAPB. This experience happened during an amazing long weekend in which I got to experience 5-MAPB for the first time.

Pleasantly Surprised positive exp #103651

Me and my girlfriend we'll call Destiny ordered 250 mg of BK-2C-B online from the clearnet and were pleasantly surprised to find out that they had given us 330 mg instead. I weighed out a 150 mg dose for myself and a 120 mg dose for her (as she's only about 110 lbs), and placed them into capsules.

Sudden Cardiac Arrest After Use cautionary exp #106208

On May 9th, 2015, a 25 year old healthy male experienced seizures and sudden cardiac arrest after consuming 140mg of bk-2C-B and 0.25g of cannabis. The subject had never experienced a seizure or cardiac incident before, and has no heart condition. This was the 116th recreational drug he had taken.

Dancing For Hours positive exp #111582

7:50pm: Dropped approximately 180mg of bk-2C-B 8:20pm: Starting to feel it. Slight tingling sensations. Feel more energized. Ready to put on some music and start my ridiculous bed dancing I do because I still do not feel comfortable standing up and doing it.

Bluelight Reference Guide Bluelight

☛ Official ☚ The Big & Dandy βK-2C-B Thread - Part 1

Welcome to the βK-2C-B (bk-2C-B) Thread Wikipedia: Bk-2C-B (1-(4-bromo-2,5-dimethoxyphenyl)-2-aminoethan-1-one) Marquis reagent test result [original post:] In these times of ketones, I wondered if anyone had tried bk-2cb? I think is correct name is 2-amino-1-(4-Bromo-2,5-dimethoxyphenyl)ethan-1-one, right? I cann't fi...

Read full thread on Bluelight →

bk-2C-B's nerd page Pharmacology, chemical data, effect profiles, and more

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Helpful Links

📘 Experience Reports 📖 TripSit 📖 PsychonautWiki 📖 Bluelight 📖 The Drug Users Bible

Import into PsychonautWiki Journal

The PsychonautWiki Journal app includes bk-2C-B, but its built-in data can be thinner than ours. Importing this file adds a separate "bk-2C-B (Substance Search)" custom substance with our dose ranges, durations and tolerance, so you can log against whichever you prefer.

⬇ Download import file Import this file as custom substances and you get "bk-2C-B (Substance Search)" with every route's full dose ladder and timeline, no typing. Works on iOS and Android (v15+); the format is confirmed by the app's developer.

Ranges are harm-reduction guidance, not a prescription.

Report an issue or suggest an edit

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bk-2C-B Well-documented Well-documented Multiple authoritative sources agree on dosing and effects. 4 corroborating sources 1 ROA with full dose ladder duration data present 28 combo interactions documented toxicity data (PsychonautWiki) classified Research-chemical