Treatment will continue until the participant withdraw consent, regulatory authority and/or PTC discontinue the study, participant's condition substantially worsens after initiating vatiquinone treatment in this study, investigator withdraws the participant from vatiquinone treatment, if, in the investigator's clinical judgment, it is not in the participant's best interest to continue, or vatiquinone becomes commercially available in a participant's country.
The primary objective of this study is to assess the long-term safety of vatiquinone in participants with Friedreich ataxia (FA) previously exposed to vatiquinone in Study PTC743-NEU-003-FA (NCT04577352) or Study PTC743-NEU-005-FA.