Bellaria

Researchers are evaluating the safety and tolerability of TAK-861 in people with narcolepsy type 1 (NT1) who have already been exposed to TAK-861 in earlier studies. The study also aims to observe improvements in symptoms such as excessive daytime sleepiness and the frequency of cataplexy episodes. This long-term extension trial continues from previous phase 2 and phase 3 trials and includes participants who completed those earlier studies. All participants in this trial will receive TAK-861 tablets. Those who were previously given a placebo in parent trials will be randomly assigned to a dose of TAK-861. The study plans to enroll up to 500 participants worldwide and will last approximately 5 years, or until the study is stopped or the drug is approved and launched. Participants will visit clinics multiple times, with some visits possibly done at home, and will have a follow-up check 4 weeks after their last dose. During the study, participants will be monitored for treatment-emergent adverse events from the time they consent until 4 weeks after their final dose, covering up to about 5 years. Researchers will assess safety and tolerability regularly through these visits and follow-ups. The focus is on identifying any side effects and understanding the long-term effects of TAK-861 in people with NT1.