Study of Carbetocin Nasal Spray for the Treatment of Hyperphagia in Prader-Willi Syndrome

Inclusion Criteria:

• Male or female and 5 through 30 years of age

• Prader-Willi syndrome with a documented disease-causing mutation

• Increased appetite with decreased satiety accompanied by food seeking (consistentwith PWS Nutritional Phase 3)

• HQ-CT total score of ≥13 at Screening and Baseline

• CGI-S score for hyperphagia in PWS of ≥4 at Screening and Baseline

• Lives with a caregiver who understands and is willing and able to adhere tostudy-related procedures and is willing to participate in all study visits

Exclusion Criteria:

• Genetically diagnosed with Schaaf-Yang syndrome or another genetic, hormonal, orchromosomal cognitive impairment besides PWS

• An active upper respiratory infection at the Screening visit or the Baseline visit

• Any clinically significant cardiovascular disorder, renal, hepatic,gastrointestinal, or respiratory disease, including severe asthma

• History of, or current, cerebrovascular disease, brain trauma, epilepsy, or frequentmigraines. A history of febrile seizures is not exclusionary

• Nasal surgery within 1 month of Screening visit or planning to have nasal surgeryduring the study.

• Unwilling to abstain from nasal saline, other nasal irrigation, and other intranasalmedications during the Screening period and through the treatment period of thestudy

• Clinically significant irritability or agitation, requiring initiation of orincrease in the dose of antipsychotic medication, within the 6 months prior to theScreening visit

• Used prostaglandins, prostaglandin analogues, or prostaglandin agonists in the 3months prior to the Baseline visit. Inhibitors of prostaglandin synthesis, such asnonsteroidal anti-inflammatory drugs, are not exclusionary.

• Started a glucagon-like peptide 1 (GLP-1) agonist within the 6 months prior to theScreening visit. Treatment with GLP-1 agonist is allowed if the subject has beentaking it for more than 6 months prior to Screening.

• Used oxytocin, desmopressin (DDAVP), or tesofensine within 6 months prior to theBaseline visit

• Active psychotic symptoms, a history of psychotic symptoms, or a psychotic disorder

• History of suicide attempt or inpatient psychiatric hospitalization

• New food-related interventions, including environment or dietary restrictions,within 1 month of the Screening visit

Additional inclusion/exclusion criteria apply. Subjects will be evaluated at screening to ensure that all criteria for study participation are met.