MDBD and bk-MDBD

[keytonius]

Does anyone know the difference between MDBD and bk-MDBD?Which one is Methyl-J, and which butylone...and does either cause nystagmus?
Thanks,K

 

[Black]

mbdb (not mdbdb) is methyl-j while bk-mbdb is butylone.
mbdb is the entactogen (likely being able to cause nystagmus; i don't have first hand experience and reports are quite rare) and bk-mbdb is the stimulant.

 

[WorldWarMe]

http://www.erowid.org/experiences/exp.php?ID=10514

and

http://www.erowid.org/experiences/exp.php?ID=56006

Both say that MBDB gives you Nystagmus.