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