Methylbutyltryptamine (MBT), also known as N-methyl-N-butyltryptamine, is a lesser-known psychedelic drug of the tryptamine family related to dimethyltryptamine (DMT).
In his book TiHKAL (Tryptamines I Have Known and Loved), Alexander Shulgin lists the dose of MBT as 250 to 400mg orally and the duration as 4 to 6hours. MBT produces a heavy body load with dehydration, and causes visuals similar to those of DMT. Very little data exists about the pharmacological properties, metabolism, and toxicity of MBT.
The chemical synthesis of MBT has been described.
Analogues of MBT include 4-HO-MBT, 5-MeO-MBT, methylethyltryptamine (MET), methylpropyltryptamine (MPT), methylisopropyltryptamine (MiPT), methylallyltryptamine (MALT), among others.
TiHKAL mentions that a structural isomer of MBT exists, with the butyl group attached at the nitrogen atom. It is known as N-sec-butyl-N-methyltryptamine, or MSBT. However, little is known about its psychoactivity.