Mol. Mass

221.2524 g/mol

Other common names

β-keto-N-methylbenzodioxolylpropylamine , bk-MBDB



Butylone (β-keto-N-methylbenzodioxolylpropylamine) or bk-MBDB is a research chemical in the phenethylamine class. It is a synthetic empathogen that produces effects similar to MDMA, but milder. This chemicals “bk” prefix comes from it being the β-keto analogue of MBDB. Although it was synthesized by a team in 1967, it remained unknown until a chemical supply company found the synth in 2005. This company then synthesized it on a large scale and distributed it to the grey market as a research chemical. Formal research was conducted on butylone in 2009, producing results that showed the resemblance with methylone and other drugs in its class by the rate at which it is metabolized. Butylone is currently unscheduled in the United States, but could be covered in the analogue because of its similarity to MDMA. With this in mind, if butylone were to be sold for human consumption, prosecution under the Federal Analogue Act is definitely possible. To my knowledge, there are no existing ca ses as of now. It has been successfully scheduled in Denmark, Japan, Norway, Slovak Republic, and the UK.



The dose chart below is merely a collective average of the user reports I have read. Re-dosing is not suggested, but some users claim that a supplementary boost during the come up will greatly increase effects. Compulsive re-dosing can put the user in a really bad spot, often diminishing the ability to sleep for days and creating an uncomfortable amount of stimulation that can last for quite some time. As with all substances, especially research chemicals, extreme caution should be used when experimenting.

Threshold – 60mg

Common – 100 – 150mg

Strong – 150 – 200mg

Heavy – 200mg+



User Reports:

A great deal of user reports have described butylone’s effects as being similar to MDMA, only slightly more stimulating with an absence of a euphoric push. It has been noted by some to be sort of lacking by itself, but state when mixed with other phenethylamines and tryptamines it is quite remarkable. The most popular form of ingestion is oral, but there are many reports of users insufflating butylone to produce recreational effects. Although less is required to produce effects when ingesting via insufflation, the duration of effects is decreased. Positive effects reported include euphoria, mood lift, increased awareness of senses, increased willing to communicate, ego softening, increased appreciation of music, and an overwhelming sense of well-being. Pupil dilation is very common when butylone is ingested, and some users have reported feeling a slight increase of body temperature and heart rate. The negative effects of butylone usually are brought on with higher doses, but are definitely not limited to them. Muscle tension, confusion, paranoia, gastrointestinal discomfort, heart racing have all been noted as negative effects. Next day hangover is minimal if felt at all, and very rarely consists of more than a minor headache. The urge to re-dose is not as prevalent with butylone as it is with methylone, but is not unheard of.