Methylenedioxybutylamphetamine (MDBU or 3,4-methylenedioxy-N-butylamphetamine) is a lesser-known psychedelic drug. It is also the N-butyl derivative of 3,4-methylenedioxyamphetamine (MDA). MDBU was first synthesized by Alexander Shulgin. In his book PiHKAL, the minimum dosage is listed as 40 mg, and the duration unknown.[1] MDBU produces few to no effects. Very little data exists about the pharmacological properties, metabolism, and toxicity of MDBU.