TAK-418 is an orally active, blood-brain barrier-penetrant LSD1 inhibitor with a human IC50 of 2.9 nM. TAK-418 irreversibly inhibits LSD1 by forming a compact flavin-FAD adduct with the catalytic domain FAD, blocking the demethylation of H3K4me1/2 and H3K9me1/2 without disrupting the LSD1-GFI1B interaction. TAK-418 restores normally dysregulated brain gene expression and DNA methylation, increases H3K4me1/2/3 and H3K9me2 at the Ucp2 locus, and induces Ucp2 mRNA expression. TAK-418 rescues defective H3K4 histone modifications, normalizes adult neurogenesis, and improves recognition memory, social behavior, and cognition in rodent models. TAK-418 can be used in research related to neurodevelopmental disorders, Alzheimer's disease, and autism spectrum disorders .