Hypothalamic obesity treatment
Amount
400-600 mg
Frequency
Once daily
Duration
14 weeks (Phase 2 trial)
Route
OralTiming
Once-daily oral tablet. Significant practical advantage over setmelanotide, which requires daily subcutaneous injections.
Duration
Ongoing (long-term use expected)
Repeatable
Yes
CMP (Comprehensive Metabolic Panel)
When: Baseline
Why: Baseline liver and kidney function
Fasting glucose and HbA1c
When: Baseline
Why: Baseline metabolic status
Cortisol and pituitary panel
When: Baseline
Why: Assess hypothalamic-pituitary function given target population
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Bivamelagon (LB54640) is an oral small molecule melanocortin-4 receptor (MC4R) agonist developed by Rhythm Pharmaceuticals, licensed from LG Chem. It represents the first oral MC4R agonist in clinical development for hypothalamic obesity, a rare and severe form of obesity caused by hypothalamic damage that has very few effective treatments.
Bivamelagon activates the melanocortin-4 receptor in the hypothalamus, a critical node in the brain's appetite and energy regulation circuitry. MC4R activation suppresses hunger and increases energy expenditure. In hypothalamic obesity, this pathway is disrupted due to structural damage; bivamelagon aims to restore MC4R signaling downstream of the damaged regions.
A Phase 2 trial evaluated bivamelagon in patients aged 12 and older with hypothalamic obesity. At 14 weeks, 600 mg daily achieved a 9.3% BMI reduction and 400 mg achieved 7.7%. Hunger scores decreased by more than 2.8 points, suggesting meaningful appetite suppression in a population that typically experiences relentless hyperphagia.
Bivamelagon is investigational and not approved by any regulatory authority. It is being developed for a rare disease indication (hypothalamic obesity), not general obesity. Data are limited to a Phase 2 trial with a 14-week duration.
Phase 2 Study of Bivamelagon in Hypothalamic Obesity, published in Conference presentation (Rhythm Pharmaceuticals) (Rhythm Pharmaceuticals investigators, 2025):
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See real-world usage patterns alongside the clinical evidence above. Community-sourced, not clinically verified.
0View community protocolsMelanotan-1 (Afamelanotide): Approved alpha-MSH analog. Covers melanocortin mechanism, Scenesse for EPP, photoprotective tanning, and safety data.
Melanotan-2: Cyclic melanocortin peptide for tanning and sexual function. Covers MC1R/MC4R activation, dosing protocols, side effects, and regulation.
PT-141 (Bremelanotide): FDA-approved for hypoactive sexual desire. Covers MC4R mechanism, Vyleesi trial data, dosing, and side effects.
Setmelanotide (IMCIVREE): FDA-approved MC4R agonist for rare genetic obesity due to POMC, PCSK1, or LEPR deficiency. First-in-class targeted therapy for monogenic obesity.
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