Bellaria

Researchers are evaluating the safety and tolerability of TAK-861 in people with narcolepsy type 1 NT1. This study focuses on participants who have already been exposed to TAK-861 doses in previous clinical trials. The goal is to monitor how TAK-861 affects symptoms such as excessive daytime sleepiness and cataplexy episodes over a long period. All participants in this trial will receive TAK-861 tablets. Those who previously received a placebo will be randomly assigned to one of the TAK-861 dose groups. The study is a long-term extension conducted worldwide and is expected to last approximately five years or until the product is approved or the study is stopped. Participants may switch doses as needed and will attend multiple clinic visits, some of which can be done at home. Throughout the trial, participants will be regularly assessed for safety by tracking any treatment-emergent adverse events. Researchers will also measure changes in sleep latency, sleepiness scores, and cataplexy rates compared to baseline data from earlier trials. Follow-up assessments will take place four weeks after the final dose to monitor ongoing effects and ensure participant safety.