5-(2-Aminopropyl)-1-benzothiophene (5-APBT) is a monoamine releasing agent and serotonin receptor agonist of the amphetamine and benzothiophene families. It is related to MDA and other MDA bioisosteres like the benzofurans.

The drug acts as a potent serotonin–norepinephrine–dopamine releasing agent (SNDRA) and full agonist of the serotonin 5-HT₂ receptors. It has approximately 4- and 9-fold preference for induction of serotonin release over norepinephrine and dopamine release, respectively, in rat brain synaptosomes. 5-APBT does not increase locomotor activity in rodents and hence does not appear to have stimulant-like effects. However, it does produce the head-twitch response, a behavioral proxy of psychedelic effects, and hence may have hallucinogenic effects.

5-APBT was first described in the scientific literature by 2020.