FDA Policy/General
Reg Review Period for Ultragenyx’s Crysvita
Federal Register notice: FDA has determined for patent extension purposes the regulatory review period for Ultragenyx’s Crysvita (burosumab-twza), indicated for treating X-linked hypophosphatemia in adult and pediatric patients. The regulatory review period is 3,485 days, which includes 3,241 days that occurred during the testing phase