PT-141, also known as Bremelanotide, is a synthetic peptide analog derived from the melanocortin peptide family. Originally investigated for its effects on melanocortin receptors particularly MC3R and MC4R—PT-141 has been primarily studied in the context of neuroendocrine signaling, vascular modulation, and central nervous system pathways. Its mechanism of action differs significantly from traditional peripheral vasodilators, as it exerts effects through central receptor activation rather than direct action on blood vessels.