Intranasal Oxytocin vs. Placebo for the Treatment of Hyperphagia in Prader-Willi Syndrome

Inclusion Criteria:

1. Male or female pediatric outpatients aged 5 to 17 years

2. Must be in PWS nutritional phase 2b or 3 as determined by PI

3. Must be on growth hormone treatment and have been receiving stable doses of growth
hormone treatment for at least one year prior to screening date. Treatment cannot have
been interrupted for more than one week within 3 months of screening.

4. Diagnosis of PWS confirmed by exam, genetic testing and patient medical records.

5. A score of at least moderate severity on the Hyperphagia Questionnaire for Clinical
Trials at both screening and baseline visits.

6. Stable dosages of hormone treatments (including testosterone and estrogen supplements)
for 4 weeks prior to randomization and for the duration of the study.

7. Stable dosages of metabolic treatments that could affect appetite (including
metformin) for 4 weeks prior to randomization and for the duration of the study.

8. Physical exam and laboratory results that are within the normal range for individuals
with PWS.

9. Presence of a parent/caregiver/guardian that is able to consent for their
participation and complete assessments regarding the child's development and behavior
improvement throughout the study.

Exclusion Criteria:

1. Exposure to any investigational agent in the 30 days prior to randomization.

2. Child not receiving growth hormone treatment

3. Children weighing less than 40 lbs

4. Children with unstable Type 2 Diabetes confirmed by Hemoglobin A1C levels at screening

5. Children with unstable medical co-morbidities at baseline.

6. Children with active upper respiratory infections at screening.

7. A primary psychiatric diagnosis other than ASD, including bipolar disorder, psychosis,
schizophrenia, PTSD or MDD. These patients will be excluded due to potential
confounding results.

8. Pregnant or lactating patients or patients who will not agree to use a double barrier
method of contraception. IN-OXT has not been studied in pregnant or lactating women.

9. Females using an estrogen-based contraceptive. As an alternative to an estrogen based
contraceptive, subjects will be counseled to use progesterone-based contraceptives;
cervical cap; cervical sponges; or spermicidal foam in combination with a condom.
Subjects will need to use a double barrier method to be in the study.

10. A medical condition that might interfere with the conduct of the study, confound
interpretation of study results or endanger the subject's well-being.

11. A known diagnosis of Rett's Syndrome of Childhood Disintegrative Disorder or marked
sensory impairment such as deafness or blindness.

12. Subjects who have changes in allied health therapies, behavioral or educational
interventions within four weeks prior to randomization other than those associated
with school holidays.

13. Subjects who have had changes in medications or medication doses of risperidone,
apriprazole, other antipsychotic medications, clonidine, guanfacine, stimulants or
anti-convulsants within four weeks of randomization.