just tried this one for the first time last night
Strange- I have had this one on the backburner for 2 weeks and in a spur-of-the-moment decision last night I consumed a capsule of bk-MBDB and bk-MDMA. Here's my narrative:
t = 9:15pm
t+0 +80mg bk-MBDB +80 bk-MDMA (taken in gelatin capsule).
t+0:45 A couple of alerts, but still +/- at t+1h.
t+1:01 +70mg bk-mbdb (taken wrapped in single ply tissue).
t+1:10 Positive mood lift, slight sense of phenethylamine signature.
t+1:25 Slightly shaky, buzzing, a little gassy (last ate 2 hours ago), positive mindset, significant pupil dilation (75

.
t+1:40 Heart rate 110/min, feel physically stimulated, body sensations are very pleasurable, virtually indistinguishable from MDMA. Emotional and mental effects are less significant.
t+2:10 A fair degree of time dilation- pleasantly both sedated and energetic feelings.
t+2:20 While listening to psychedelic dance music I feel exactly like I'm on MDMA, getting some jaw-tension. Very happy about taking the extra 80mg of bk-MBDB.
t+2:45 Feels like a plateau has been reached. Somewhat dehydrated.
t+3:00 After 20 minutes of euphoric rushes, I got hit with a slight "sketchy" feeling, a non-directional "something's not right". After becoming distracted, the feeling went away. I'm including this mention because it seems like it could have turned into the beginning of a dysphoric episode if allowed to fester. Ultimately it was self-resolving.
t+3:15 Euphoria has mostly dropped off, but still feel pretty good. Senses are heightened.
t+3:45 I would categorize most of the remaining effects as "side effects" or "after effects" because the main experience during the past 2.5 hours was highly euphoric. Effects now are closer to the winding-down of MDMA/MDA type, fairly pleasant glow, but a clear feeling of "I wish I was where I was an hour ago!" Stimulant effects continue on through the next leg of the experience, where 83mg of s-ketamine hcl was insufflated to highly positive effect.
Sleep attempted at t+5:15, wasn't very successful. Risidual stimulation made it impossible to keep my eyes shut. Finally drifted off at about 4:30am, t+7:15.
Overall, the combination of bk-MBDB and bk-MDMA was extremely positive. Having experimented with methylone at "effective" dosage only once before and having been fairly dissapointed in the overwhelmingly dopaminergic response, this combination produced a virtual ringer for MDMA in terms of body sensations and euphoria. The emotional response and mental opening (all-encompassing white light effect)
was not as pronounced as with MDMA, but it was not disappointing or missed as it gave a defining difference to the cathinone analogs. I'll definitely be trying this one again, perhaps at the same ratio ~2:1/b1:m1.