A Study of Diazoxide Choline in Patients With Prader-Willi Syndrome

Inclusion Criteria:

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

- Genetically-confirmed Prader-Willi syndrome and hyperphagic

- In a stable care setting for at least 6 months prior to Visit 1

- Caregiver must have been caring for the patient for at least 6 months prior to Visit 1

Exclusion Criteria:

- Have participated in an interventional clinical study (i.e., investigational drug or
device, approved drugs or device evaluated for unapproved use) within prior 3 months

- Positive urine pregnancy test (in females of child-bearing potential) or females who
are pregnant or breastfeeding, and/or plan to become pregnant or to breast-feed during
or within 30 days after study participation

- Any other known disease and/or condition, which would prevent, in the opinion of the
Investigator, the patient from completing all study visits and assessments required by
the protocol