Orexin A (human, rat, mouse) (Hypocretin-1 (human, rat, mouse)) TFA, a 33 amino acid excitatory neuropeptide, orchestrates diverse central and peripheral processes. Orexin A (human, rat, mouse) TFA is a specific, high-affinity agonist for G-protein-coupled receptor OX1R. Orexin A (human, rat, mouse) TFA has a role in the regulation of feeding behavior. Orexin A (human, rat, mouse) TFA is an effective anti-nociceptive and anti-hyperalgesic agent in mice and rats.