PWSA Blog

Update on Phase 3 COMPASS PWS Study from Acadia

September 24, 2024

Dear Prader-Willi Syndrome Community,

We are pleased to share an update on the 12-week, pivotal Phase 3 COMPASS PWS study
evaluating the efficacy and safety of carbetocin nasal spray (ACP-101), an investigational
drug, for the treatment of hyperphagia in Prader-Willi syndrome. The study was initiated in
the United States in November 2023 and will include approximately 170 children and adults
aged 5 to 30 years of age.

Key Updates:

  1. *Clinical study sites in the United States, Canada, and the United Kingdom are
    participating in the Phase 3 COMPASS PWS study and are accepting patients.
    Additional sites are pending in the United States, Canada, and Europe.
  2.  
  3. *Participants who complete the 12-week Phase 3 study will be eligible to enroll in a
    long-term, 36-month open-label extension study designed to investigate the safety
    and tolerability of long-term treatment with carbetocin nasal spray.

For more information on the COMPASS PWS study, including who can participate and
which trial sites are enrolling new participants, please visit the trial website at
CompassPWS.com. The website features a “Find a Research Site” tool that is updated on
an ongoing basis as trial sites open and are accepting referrals. To be contacted about
potential participation, there is a form to fill out on the website. If you have visited the
COMPASS PWS website and registered participation interest, your information has been
appropriately recorded and passed on to the closest clinical trial site available. The sites will
determine if interested families are suitable to participate.


If you have questions about the Phase 3 COMPASS PWS study, please contact us at
compasspws@acadia-pharm.com. We remain steadfast in our commitment to pursue this
investigational treatment to address a severely unmet need for those living with Prader-Willi
syndrome. We are grateful for the community’s participation, partnership, and continual
inspiration through your unwavering dedication to your loved ones.

Thank you for your continued support.

All our best,
The Acadia Prader-Willi Syndrome Team

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