This Phase 3 study examines whether NNZ-2591, an investigational medication, can improve communication and daily living skills in children with Phelan McDermid syndrome.
Who can take part:
- Ages 3 to 12 years
- A diagnosis of Phelan McDermid syndrome with a documented SHANK3 genetic change
- Body weight over 22 pounds (10 kg)
What is involved: 11 visits over 5 months, 5 at Cortica Marin or Cortica Glendale and 6 by telehealth. There is no cost to participate, families receive $100 for each on-site visit, and travel support is available for families outside California.





