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Melanocortin-4 receptor (MC4R) agonist peptide

Setmelanotide

Setmelanotide is a synthetic cyclic octapeptide that selectively activates the melanocortin-4 receptor (MC4R), a signaling hub in the brain's appetite pathway. Sold as Imcivree, it is an approved prescription medicine for certain rare genetic conditions. This page is educational and not medical advice.

By The Peptides Codex Editorial TeamReviewed July 10, 2026
Length
8 aa
Class
Melanocortin-4 receptor (MC4R) agonist peptide
Function
Selective activation of the MC4 receptor in appetite pathways
Context
Prescription medicine approved for rare genetic conditions

A cyclic MC4R agonist approved for specific rare genetic disorders.

Also known as: Imcivree · RM-493

Part of the Metabolic & GLP-1 peptides cluster

Overview

Setmelanotide is a synthetic cyclic octapeptide that selectively activates the melanocortin-4 receptor (MC4R), a signaling hub in the brain's appetite pathway. Sold as Imcivree, it is an approved prescription medicine for certain rare genetic conditions. This page is educational and not medical advice.

Source & context

Biological / chemical source: Synthetic cyclic octapeptide

Primary research or clinical context: Prescription medicine approved for rare genetic conditions

Receptor target

The MC4 receptor sits within the leptin-melanocortin pathway that helps regulate energy balance. Setmelanotide is engineered as a cyclic, disulfide-containing octapeptide to bind MC4R with high selectivity. Its design reflects decades of melanocortin peptide chemistry aimed at receptor specificity.

Approval and status

Setmelanotide received FDA approval in 2020 and EU approval in 2021 for narrowly defined rare genetic disorders, and is a prescription-only therapeutic. It is used strictly under specialist supervision. This summary describes the peptide and its target for educational purposes and makes no therapeutic claims.

FAQ about Setmelanotide

What is Setmelanotide?+

Setmelanotide is a synthetic cyclic octapeptide that selectively activates the melanocortin-4 receptor (MC4R), a signaling hub in the brain's appetite pathway. Sold as Imcivree, it is an approved prescription medicine for certain rare genetic conditions. This page is educational and not medical advice.

Is Setmelanotide an approved medicine?+

Setmelanotide: Prescription medicine approved for rare genetic conditions. Always follow licensed medical guidance for approved products.

What is the typical length of Setmelanotide?+

Setmelanotide is commonly described as approximately 8 amino acids (Melanocortin-4 receptor (MC4R) agonist peptide).

Related peptides

References & further reading

  1. 1.Wikipedia — Setmelanotide
  2. 2.PubChem — compound summary for Setmelanotide (CID 11993702)
Disclaimer: Educational content only. Not medical advice. Not instructions for human use. Research peptides and unapproved products may be restricted or illegal to market for human consumption in your jurisdiction. Consult qualified professionals and applicable law.
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Cite this: Peptides Codex — Setmelanotide educational profile.
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