Sustained release peptide formulations

This disclosure provides, at least in part, a pharmaceutical product comprising: setmelanotide (also known as RM493); setmelanotide as sole active pharmaceutical ingredient formulated for injection; setmelanotide as the sole active ingredient; setmelanotide as the active pharmaceutical ingredient; setmelanotide as the active pharmaceutical ingredient for injection; or another pharmaceutical composition that has its primary mechanism of action at the MC4 receptor as an agonist (referred to herein as an MC4RAp), e.g., a lipid excipient, and/or a pharmaceutically acceptable carrier. The pharmaceutical product described herein provides a sustained release of setmelanotide or another pharmaceutical composition, which may result in a more desirable pharmacokinetic and pharmacodynamic profile upon administration.