Positive trial results for Rhythm Pharma oral MC4R agonist bivamelagon

9 July 2025

Shares of US biopharma Rhythm Pharmaceuticals (Nasdaq: RYTM) rose 27.4% to $82.96 in early trading today, as it announced positive top-line results from its Phase II trial evaluating bivamelagon (formerly LB54640), an investigational oral melanocortin-4 receptor (MC4R) agonist, in patients with acquired hypothalamic obesity.

Bivamelagon achieved statistically-significant and clinically-meaningful reductions in body mass index (BMI) at 14 weeks of treatment, consistent with BMI reductions achieved with the company’s setmelanotide therapy in similar patient populations in past trials. Rhythm in-licensed bivamelagon from LG Chem in January 2024.

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