PNU-22394, or PNU-22394A, also known as U-22394A, as well as 6-methyl-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole, is a serotonin 5-HT2 receptor agonist of the ibogalog family which was studied as an appetite suppressant and antipsychotic but was never marketed. As an ibogalog, PNU-22394 is a cyclized tryptamine and a simplified ibogaine analogue.