Selank is a synthetic heptapeptide anxiolytic and nootropic drug developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. It is a synthetic analog of the immunomodulatory peptide tuftsin, consisting of the tuftsin sequence (Thr-Lys-Pro-Arg) elongated at the C-terminus with Pro-Gly-Pro for enhanced metabolic stability. Selank exhibits pronounced anxiolytic, nootropic, neuroprotective, and immunomodulatory activities through modulation of GABAergic, serotonergic, and dopaminergic neurotransmitter systems, along with regulation of brain-derived neurotrophic factor (BDNF) expression.