Harmony Biosciences Announces Plans to Initiate Phase 3 Registrational Study of Pitolisant in Prader-Willi Syndrome

Harmony Biosciences

PLYMOUTH MEETING, PA — Harmony Biosciences Holdings, Inc. (Nasdaq: HRMY) announced it has successfully completed an End-of-Phase 2 meeting with FDA regarding its clinical development plan evaluating pitolisant as a potential treatment for excessive daytime sleepiness (EDS) in patients ages six and older with Prader-Willi syndrome (PWS). Harmony plans to initiate a Phase 3 registrational study in the fourth quarter of 2023.

Based on a positive signal observed from the Phase 2 proof-of-concept study, Harmony aligned with the FDA on the proposed Phase 3 study design elements to support further investigation of pitolisant for children, adolescents and adults with PWS experiencing EDS. There is currently no FDA-approved treatment for EDS in this patient population.

“We are pleased with the outcome of our End-of-Phase 2 meeting with the FDA as we prepare to initiate our Phase 3 registrational study, which aims to further investigate the efficacy and safety of pitolisant as a potential treatment for excessive daytime sleepiness in individuals with Prader-Willi syndrome,” said Kumar Budur, MD, Chief Medical Officer at Harmony Biosciences. “Building upon the encouraging data obtained from our Phase 2 signal detection study, we remain committed to advancing our development program for pitolisant in pursuit of a new indication in people with PWS, given the high unmet medical need in this population.”

There are currently 15,000 – 20,000 people in the US living with PWS, a genetic condition often diagnosed in childhood. More than half of patients experience EDS.

Pitolisant is marketed as WAKIX® in the U.S. and is FDA approved to treat EDS or cataplexy in adult patients with narcolepsy. Pitolisant is not approved for use in patients with PWS and is currently being evaluated as an investigational agent in this patient population.

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