Alpha methyltryptamine (AMT) is a tryptamine (indole ethylamine) derivative, which was developed in the 1960's by Upjohn with the intention for use as an antidepressant. It was used in Russia under the trade name Indopan for the treatment of Bipolar disorder and some form of depression, but currently not being produced because of serious side effects. In the 1990's, alpha-methyltryptamine became regulated as a Schedule I controlled substance in the United States. Pharmacologically, AMT has high affinity for the serotonin (5-HT) transporter, a number of 5-HT receptors, and potently inhibits reuptake of monoamines dopamine, 5-HT, and norepinephrine reuptake. AMT is also a monoamine oxidase A inhibitor that conceivably could contribute to its pharmacological effect and this drug also the most potent inhibitor of semicarbazide-sensitive amine oxidase (SSAO).

5-(2-Aminopropyl)benzofuran (5-APB) is an empathogenic psychoactive compound of the substituted benzofuran, substituted amphetamine and substituted phenethylamine classes. 5-(2-Aminopropyl)benzofuran is a serotonin–norepinephrine–dopamine reuptake inhibitor and serotonin–norepinephrine–dopamine releasing agent. The toxicity and long-term health effects of recreational 5-APB use do not seem to have been studied in any scientific context and the exact toxic dosage is unknown/ 5-(2-Aminopropyl)benzofuran 's high affinity for the 5-HT2b receptor makes it likely that 5-APB would be cardiotoxic with long-term use, as seen in other 5-HT2B agonists such as fenfluramine and MDMA.