Evaluating pitolisant for excessive daytime sleepiness in Prader-Willi syndrome
Official title: A Phase 3, Randomized, Double-Blind, Placebo-controlled, Efficacy and Safety Study of Pitolisant Followed by an Open-Label Extension in Patients With Prader-Willi Syndrome
Run by Harmony Biosciences Management, Inc. · NCT06366464 · Data updated 2026-11-12
This study is testing if a medication called pitolisant can help reduce excessive daytime sleepiness in people aged 6 and older with Prader-Willi syndrome.
Quick facts
| Phase | Phase 3 |
|---|---|
| Study type | Interventional |
| Ages | 6 Years and up |
| Sex | All |
| Enrollment | 134 (estimated) |
| Sponsor | Harmony Biosciences Management, Inc. Industry-sponsored |
| Locations | 57 sites (Los Angeles, California and 56 other locations) |
| Status | Recruiting |
| Started | May 28, 2024 |
| Main results expected | April 2027 |
| Study ends | April 2028 |
| Registry record updated | August 25, 2026 |
| Trial ID | NCT06366464 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are individuals aged 6 and older with a genetically confirmed diagnosis of Prader-Willi syndrome and excessive daytime sleepiness.
✕Probably not a fit
Patients with uncontrolled sleep apnea or hypersomnia due to other medical disorders may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This Phase 3 clinical study investigates the efficacy and safety of pitolisant in treating excessive daytime sleepiness in patients aged 6 and older with Prader-Willi syndrome. The study is randomized, double-blind, and placebo-controlled, involving multiple centers globally. Participants will undergo a screening period followed by a treatment phase where they will receive either pitolisant or a placebo. Secondary objectives include assessing the drug's impact on behavioral issues such as irritability and hyperphagia.
Why it matters
Potential benefit: If successful, this treatment could significantly improve daytime alertness and overall quality of life for patients with Prader-Willi syndrome.
How similar studies have gone: While this approach is novel for Prader-Willi syndrome, similar studies have shown promise in treating excessive daytime sleepiness in other conditions.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Genetically confirmed diagnosis of PWS * Excessive daytime sleepiness * Has a consistent parent/caregiver (preferably the same person throughout the study) who is willing and able to complete the required study assessments. * In the opinion of the Investigator, the patient/parent(s)/caregiver(s)/legal guardian(s) are capable of understanding and complying with the requirements of the protocol and administration of oral study drug. Exclusion Criteria: * Has a diagnosis of sleep apnea (OSA, CSA) that is not adequately controlled * Has a diagnosis of hypersomnia due to another sleep/medical disorder * Participation in an interventional research study involving another investigational medication, device, or behavioral treatment within 30 days or 5 half-lives (whichever is longer) of the investigational medication prior to Screening
Where it's running
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Santa Monica Clinical Trials
Los Angeles, California, United States Recruiting -
Center of Excellence in Diabetes and Endocrinology
Sacramento, California, United States Recruiting -
Rady Children's Hospital - Scan Diego
San Diego, California, United States Recruiting -
Colorado Children's Hospital
Aurora, Colorado, United States Recruiting -
Nemours Children's Hospital
Wilmington, Delaware, United States Recruiting -
Emory University School of Medicine
Atlanta, Georgia, United States Recruiting
Show 44 more locations
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Ann And Robert H Lurie Children's Hospital of Chicago
Chicago, Illinois, United States Recruiting -
Riley Children's Hospital
Indianapolis, Indiana, United States Recruiting -
Johns Hopkins University Hospital
Baltimore, Maryland, United States Recruiting -
Johns Hopkins Hospital
Baltimore, Maryland, United States Recruiting -
Mayo Clinic-PPDS
Rochester, Minnesota, United States Recruiting -
Maimonides Medical Center
Brooklyn, New York, United States Recruiting -
Montefiore Medical Center
The Bronx, New York, United States Recruiting -
Science 37 (at-home option)
Morrisville, North Carolina, United States Recruiting -
Science 37
Morrisville, North Carolina, United States Recruiting -
Center for Human Genetics
Cleveland, Ohio, United States Recruiting -
Texas Children's Hospital
Houston, Texas, United States Recruiting -
Road Runner Research
San Antonio, Texas, United States Recruiting -
Childrens Hospital of Wisconsin
Milwaukee, Wisconsin, United States Recruiting -
Queensland Children's Hospital
Brisbane, Queensland, Australia Recruiting -
Royal Prince Alfred Hospital
Camperdown, Australia Recruiting -
Sydney Children's Hospital
Randwick, Australia Recruiting -
Children's Hospital at Westmead
Westmead, Australia Recruiting -
UZ Brussels
Jette, Belgium Recruiting -
AMNDX Inc.
Thornhill, Ontario, Canada Recruiting -
Aarhus University Hospital
Aarhus, Denmark Recruiting -
Rigshospitalet
Copenhagen, Denmark Recruiting -
CHU d'Angers
Angers, France Recruiting -
CHU de Toulouse-Hôpital Des Enfants
Toulouse, France Recruiting -
University Hospital Essen
Essen, Germany Recruiting -
University of Florence
Florence, Tuscany, Italy Recruiting -
Azienda Ospedaliero Universitaria A Meyer
Florence, Italy Recruiting -
Istituto G Gaslini Ospedale Pediatrico IRCCS - INCIPIT - PIN
Genova, Italy Recruiting -
Ospedale San Raffaele S.r.l. - PPDS
Milan, Italy Recruiting -
Azienda Ospedale Università Padova - Dipartimento Salute della Donna e del Bambino - INCIPIT - PIN
Padova, Italy Recruiting -
Ospedale Pediatrico Bambino Gesù IRCCS
Roma, Italy Recruiting -
IRCCS Materno Infantile Burlo Garofolo - INCIPIT - PIN
Trieste, Italy Recruiting -
Samodzielny Publiczny Szpital Kliniczny
Szczecin, Poland Recruiting -
Uniwersytecki Szpital Kliniczny im. Jana Mikulicza-Radeckiego we Wroclawiu-Chalubinskiego 2-2a
Wroclaw, Poland Recruiting -
Institutul National de Endocrinologie C. I. Parhon
Bucharest, Romania Recruiting -
Institutul National de Endocrinologie C. I. Parhon
Bucharest, Romania Recruiting -
National Clinical Center for Children Neurorehabilitation "Dr. Nicolae Robanescu"
Bucharest, Romania Recruiting -
Louis Turcanu Emergency Clinical Hospital for Children
Timișoara, Romania Recruiting -
Corporacio Sanitaria Parc Tauli, Sabadell
Barcelona, Spain Recruiting -
Hospital Sant Joan de Deu
Barcelona, Spain Recruiting -
Hospital Universitario 12 de Octubre
Madrid, Spain Recruiting -
Universitario Virgen de la Victoria
Málaga, Spain Recruiting -
Karolinska Universitetssjukhuset Solna
Solna, Sweden Recruiting -
Fulbourn Hospital
Cambridge, England, United Kingdom Recruiting -
Hull Royal Infirmary
Hull, England, United Kingdom Recruiting
+7 more sites. See ClinicalTrials.gov for the full list.
Study contacts
- Study coordinator: Ann Adee
- Email: clinicaltrials@harmonybiosciences.com
- Phone: 773-383-6258
Similar studies
Other studies for the same condition or treatment. Recruiting studies are listed first.
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Group therapy to help teens with Prader-Willi regulate emotions
Teens with Prader-Willi Syndrome and their families will try a group therapy program to help calm emotions and reduce irritability and anxiety.
-
CSTI-500 in Prader-Willi Syndrome: a dose-escalation study for safety and efficacy
This study tests CSTI-500 in people aged 13–50 with Prader-Willi syndrome to see if it is safe and helps with symptoms, using increasing doses guided by blood levels.
-
Using Tirzepatide to treat obesity in young adults with Prader-Willi Syndrome and hypothalamic obesity
This study is testing if a weight loss medication called Tirzepatide can help young adults with Prader-Willi Syndrome and hypothalamic obesity lose weight and improve their health.
-
Examining autistic traits and sensory profiles in children with Prader-Willi Syndrome
This study looks at how autistic traits and sensory experiences show up in children with Prader-Willi Syndrome to better understand their needs and see if early oxytocin treatment makes a difference.
-
Inclusive physical activity program for adults with intellectual disabilities
This study is testing a new fitness program for adults with intellectual disabilities to see if it helps them be more active and feel better over 16 weeks.
-
Using vagus nerve stimulation to improve emotion and thinking in Prader-Willi Syndrome
This study is testing whether a new treatment using vagus nerve stimulation can help improve emotions and thinking skills in adults with Prader-Willi Syndrome.
How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.