0722 Demographic and Clinical Characteristics of People Receiving Once-Nightly Sodium Oxybate Treatment: A Specialty Pharmacy Data Analysis

Abstract Introduction Once-nightly sodium oxybate (ON-SXB LUMRYZ™) is approved to treat excessive daytime sleepiness (EDS) or cataplexy in patients ≥7 years of age with narcolepsy. Real-world demographic/clinical characteristics and treatment adherence in patients with narcolepsy who received ON-SXB from a specialty pharmacy were assessed. Methods Baseline demographic/clinical data were collected from Optum Frontier Therapies pharmacy for patients with ≥1 filled ON-SXB prescription, ≥1 ON-SXB-related clinical assessment, and baseline Epworth Sleepiness Scale (ESS) score from 6/1/2023-9/30/2024. Adherence (≥80% of days covered) was assessed for patients with ≥3 months of ON-SXB use. Data were stratified by narcolepsy subtype (narcolepsy type 1 NT1 and 2 NT2 when available) and prior oxybate use (transitioned from prior oxybate therapy to ON-SXB ≤30 days of index switch/were oxybate-naive or discontinued oxybate 30 days before index not-on-oxybate). Data were analyzed descriptively. Results 452 patients were identified (NT1, 55%; NT2, 37%; NT unknown, 9%; switch, 40%; not-on-oxybate, 60% oxybate-naive, n=147/271). Mean (range) age was 38.9 (16.0-88.0) years. Most patients were female (68%) and had commercial insurance (78%). Overall, 67% of patients had prior oxybate use (NT1, 72% n=179/247; NT2, 59% n=98/166; switch, 100%; not-on-oxybate, 46% n=124/271); for these patients, the most common oxybate (65%) was mixed-salt oxybates (NT1, 61%; NT2, 70%; switch, 61%; not-on-oxybate, 70%). Overall, 64% of patients used stimulants/wake-promoting agents (WPAs) (NT1, 64%; NT2, 65%; switch, 60%; not-on-oxybate, 67%). Overall, the mean (SD) baseline ESS score was 12.0 (5.5; NT1, 11.7 5.5; NT2, 12.5 5.3; switch, 11.0 5.7; not-on-oxybate, 12.7 5.3). At baseline, 29% of patients experienced severe EDS (ESS score ≥16: NT1, 26%; NT2, 30%; switch, 20%; not-on-oxybate, 34%). Of 269 patients with ON-SXB use ≥3 months, 84% (NT1, 84%; NT2, 89%; switch, 94%; not-on-oxybate, 76%) demonstrated adherence. Conclusion Patients not on an oxybate had the highest baseline ESS scores and proportion with severe EDS, despite greater stimulant/WPA utilization. Patients with NT1 used oxybates more frequently than those with NT2 despite those with NT2 having higher baseline ESS scores and a greater proportion having severe EDS, suggesting oxybates merit earlier consideration in patients with NT2. Most patients demonstrated ON-SXB adherence, indicating they would likely receive full therapeutic benefit. Support (if any) Avadel Pharmaceuticals