Treatment patterns, healthcare utilization, and costs of patients with treatment-resistant depression initiated on esketamine intranasal spray and covered by US commercial health plans.

ABSTRACT

AIMS: To describe real-world use of esketamine (ESK) intranasal spray and healthcare outcomes among patients with treatment-resistant depression (TRD) in the United States (US). METHODS: Adults with TRD initiated on ESK (index date) between 5 March 2019 (US approval date for TRD) and 31 October 2020 were sampled from IBM MarketScan Research Databases. TRD was defined as claims for ≥2 unique antidepressants during the same major depressive episode. Subgroups of the TRD cohort with comorbid cardiometabolic conditions, pain, anxiety disorder, and substance use disorder (SUD) were identified. Patients had ≥6 months of continuous health plan eligibility pre- and post-index. RESULTS: The TRD cohort comprised 269 patients; comorbidity subgroups included 123 (cardiometabolic), 144 (pain), 189 (anxiety disorder), and 58 (SUD) patients. Proportion of patients completing ≥8 ESK sessions (number of sessions in induction phase) was 61.3% in the TRD cohort and ranged from 60.2% (cardiometabolic subgroup) to 72.4% (SUD subgroup) in subgroups. Median frequency of induction sessions was every 5-8 days among the TRD cohort and subgroups. Mean mental health-related inpatient costs reduced from pre- to post-index periods in the TRD cohort (mean ± standard deviation [median] costs per-patient-per-6-months $3,480 ± $13,328 [$0] pre-ESK initiation; $3,262 ± $16,666 [$0] post-ESK initiation; mean difference -$218) and subgroups (largest decrease in cardiometabolic subgroup $4,864 ± $14,271 [$0]; $2,792 ± $15,757 [$0]; -$2,072). Mean mental health-related emergency department (ED) costs decreased in the TRD cohort ($608 ± $2,525 [$0]; $269 ± $1,143 [$0]; -$339) and subgroups (largest decrease in the SUD subgroup $1,403 ± $3,752 [$0]; $351 ± $868 [$0]; -$1,052). LIMITATIONS: This is a descriptive analysis; sample size for some comorbidity subgroups is small. CONCLUSIONS: The majority of patients completed ESK induction phase, and most dosing intervals were longer than the label recommendation. In this descriptive analysis, mental health-related inpatient and ED costs trended lower post-ESK initiation.