Side-by-Side Comparison · 2026

Afamelanotide vs Setmelanotide

Afamelanotide vs Setmelanotide — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Afamelanotide
Melanocortin Agonist

Afamelanotide is a synthetic 13-amino acid superagonist analogue of alpha-melanocyte-stimulating hormone (alpha-MSH), incorporating norleucine at position 4 and D-phenylalanine at position 7. These modifications confer ~1000-fold greater potency at MC1R than native alpha-MSH and ...

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Setmelanotide
Melanocortin Agonist

Setmelanotide (Imcivree) is a cyclic octapeptide MC4R agonist FDA-approved in 2020 for chronic weight management in adults and children (6+) with obesity caused by POMC deficiency, PCSK1 deficiency, or leptin receptor (LEPR) deficiency - rare genetic conditions causing extreme ea...

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Key Parameters
Parameter Afamelanotide Setmelanotide
Category Melanocortin Agonist Melanocortin Agonist
Research FDA Approved (2019) FDA Approved (2020)
Half-Life ~33-40 hours (from subcutaneous implant) ~11 hours SC
Typical Dose 16 mg SC implant every 60 days 2-3 mg SC once daily (adults); weight-based in children
Frequency Every 60 days (subcutaneous implant) Once daily SC
Route SC implant (biodegradable PLGA rod, 16 mg) SC injection once daily
FDA Status FDA approved 2019 for erythropoietic protoporphyria (EPP) - first drug for EPP in the US FDA approved 2020 for obesity from POMC, PCSK1, or LEPR deficiency; 2022 expanded for BBS and AHC

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Frequently Asked Questions
What is the difference between Afamelanotide and Setmelanotide?
Afamelanotide: Afamelanotide is a synthetic 13-amino acid superagonist analogue of alpha-melanocyte-stimulating hormone (alpha-MSH), incorporating norleucine at position 4 and D-phenylalanine at position 7. These mo... Setmelanotide: Setmelanotide (Imcivree) is a cyclic octapeptide MC4R agonist FDA-approved in 2020 for chronic weight management in adults and children (6+) with obesity caused by POMC deficiency, PCSK1 deficiency, o...
Which has a longer half-life, Afamelanotide or Setmelanotide?
Afamelanotide half-life: ~33-40 hours (from subcutaneous implant). Setmelanotide half-life: ~11 hours SC.
Can you stack Afamelanotide and Setmelanotide?
Afamelanotide and Setmelanotide are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.