P524 Etrasimod shows low risk of adverse events following concomitant use with opioids or antidepressants in patients with ulcerative colitis

Background Etrasimod is an oral, once-daily (QD), selective sphingosine 1-phosphate (S1P)1,4,5 receptor modulator for the treatment of moderately to severely active ulcerative colitis (UC). Unlike the other S1P receptor modulator approved for UC, etrasimod and its metabolites do not have a molecular structure to inhibit monoamine oxidase (MAO).1 Coadministration of drugs that inhibit MAO with opioids and antidepressants may increase the risk of adverse events (AEs), including hypertension.2 This post hoc analysis evaluated the incidence of AEs potentially related to serotonin syndrome in patients taking etrasimod and concomitant opioids or antidepressants in the phase 3 ELEVATE UC 52 (NCT03945188) and ELEVATE UC 12 (NCT03996369) trials. Methods Safety data pooled from both trials were analysed in patients receiving etrasimod 2 mg QD (up to 52 weeks of exposure) with/without concomitant opioids or antidepressants. We report the proportions of patients who had ≥1 concurrent AE potentially related to serotonin syndrome, consisting of one standardised MedDRA Query, one query based on the Hunter Criteria and supplemental preferred terms (pyrexia, tachycardia and hypertension-related AEs).3 Results Among 527 patients receiving etrasimod, 77 (14.6%) and 35 (6.6%) patients were taking concomitant opioids or antidepressants, respectively. Most patients on concomitant opioids or antidepressants were White (80.0–88.3%); male (50.6–51.4%); their median age was 35.0 (18.0–70.0) and 41.0 (19.0–74.0) years, respectively. More patients with vs without concomitant opioids or antidepressants, respectively, consumed alcohol (40.3% vs 24.7% and 48.6% vs 25.4%) and used tobacco (40.3% vs 20.9% and 34.3% vs 23.0%). The incidence of other AEs potentially related to serotonin syndrome was low and generally comparable in all subgroups; reported rates of pyrexia and tachycardia were similar in patients with/without concomitant opioids or antidepressants (Table). Hypertension-related AEs were infrequent and generally balanced. No AEs per the Hunter Criteria were reported in patients on concomitant opioids or antidepressants (Table). No reported AEs were serious or led to treatment discontinuation among patients taking these concomitant medications. Conclusion The incidence of AEs was low and comparable in patients receiving etrasimod with or without concomitant opioids or antidepressants. This analysis supports the low likelihood of clinically relevant drug–drug interactions between etrasimod and medications commonly prescribed to patients with UC, such as opioids or antidepressants. References 1. Lee CA et al. Clin Pharmacol Drug Dev 2023; 12: 553–571. 2. Sands BE et al. J Crohns Colitis 2023; online ahead of print. 3. Dunkley EJC et al. QJM 2003; 96: 635–642.