Phase 3 Study of Intranasal Carbetocin (LV-101) in Patients With Prader-Willi Syndrome

This is a Phase 3 randomized, double-blind study with an 8-week, placebo-controlled period
designed to test the effectiveness, safety, and tolerability of LV-101 in participants with
PWS.

Effectiveness will be measured using both caregiver-reported and clinician-reported measures
of hyperphagia (extreme hunger), obsessive and compulsive behaviors, and anxiety. Safety and
tolerability will be measured by adverse events, laboratory tests, and physical exams.

After the 8-week placebo-controlled period, there will be a long-term follow-up period of 56
weeks during which all participants will receive active treatment with LV-101. At Week 8,
participants who were randomized to placebo in the placebo-controlled period will be
randomized to one of the two LV-101 doses, administered three times per day before meals.

Inclusion Criteria:

- Genetically-confirmed Prader-Willi syndrome

- Provide voluntary, written informed consent (parent(s) / legal guardian(s) of
participant); provide voluntary, written assent (participants, as appropriate)

- PWS Nutritional Phase 3 (hyperphagic, rarely feels full)

Exclusion Criteria:

- Living in a group home

- Genetically diagnosed Schaaf-Yang syndrome or other genetic, hormonal, or chromosomal
cognitive impairment

- New food-related interventions, including environment or dietary restrictions, within
1 month of screening

- Dose of any allowed chronic concomitant medications or supplements that have not been
stable for ≥3 months prior to the study or is not expected to remain stable while
participating in the study; adjustments in growth hormone dose ≤10% are not
exclusionary

- Presence of cardiovascular disorders, epilepsy, frequent migraines, or severe asthma

- More than 3 episodes of sinusitis in the 12 months prior to Screening Visit or
presence of nasal diseases that may affect deposition of intranasal medication

- Unwilling to abstain from nasal saline, other nasal irrigation, or other intranasal
medications for 2 weeks prior to the Baseline visit and during the 8-week,
placebo-controlled period of the study

- Use of weight loss medication, oxytocin, carbetocin, or vasopressin in the 6 months
prior to screening

- Participation in an interventional research study involving another investigational
medication or device in the 6 months prior to screening or during the study

- Based on the judgment of the Investigator, is unsuitable for the study for any reason,
including but not limited to unstable medical condition, inability to comply with the
protocol, or other risk to subject or to the integrity of the study