What this phase means
Phase 3: this treatment already looked useful in smaller studies. Now it is tested in a large group, often against standard care or a dummy treatment, to see if it should be approved.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are XEN1101, or Placebo. The registry lists allocation as randomized. The X-TOLE3 Phase 3 clinical trial is a randomly assigned, neither you nor the study doctors know who gets the real treatment, compared with a dummy treatment study that will measure the clinical how well it works, whether it is safe and how hard side effects are to live with of XEN1101 administered as added on top of your current treatment therapy in focal-onset seizures.
They plan to enroll about 360 people at 103 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
A Randomized, Double-blind, Placebo-Controlled, Multicenter Phase 3 Study to Evaluate the Safety, Tolerability, and Efficacy of XEN1101 as Adjunctive Therapy in Focal-Onset Seizures
Interventions: XEN1101, Placebo
Primary outcome (registry wording): Median percent change (MPC) in focal seizure frequency from baseline to DBP for XEN1101 versus placebo.