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

Inclusion Criteria:

• Provide voluntary, written informed consent (parent(s) / legal guardian(s) ofpatient); 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 ordevice, approved drugs or device evaluated for unapproved use) within prior 3 months
• Positive urine pregnancy test (in females of child-bearing potential) or females whoare pregnant or breastfeeding, and/or plan to become pregnant or to breast-feed duringor within 30 days after study participation
• Any other known disease and/or condition, which would prevent, in the opinion of theInvestigator, the patient from completing all study visits and assessments required bythe protocol