Patient Perspectives on Switching from Infliximab to Infliximab-dyyb in Patients with Rheumatologic Diseases in the United States.

Objective: The introduction of biosimilars for rheumatologic diseases (RDs) has provided a potentially lower-cost therapy compared with their bio-originator products; however, adoption of biosimilars may be challenged by patient perceptions. The objective of this study was to describe patients' perspectives of switching from infliximab to infliximab-dyyb.

Methods: This was a survey of adult patients with RDs who qualified for switching from infliximab to infliximab-dyyb therapy between September 1 2017 and January 31 2018. Verbal consent was obtained prior to administration of a telephone survey. Survey questions were focused on the safety, efficacy, and knowledge of biosimilar therapy.

Results: A total of 108 patients were identified with 52 (48%) patients consenting to study participation. Forty (77%) and 12 (23%) patients reported switching and not switching, respectively, to infliximab-dyyb. Regarding disease control, most respondents (80%) were satisfied to very satisfied with the switch to infliximab-dyyb. Major concerns reported for switching included not knowing enough about the medication (38%), potential side effects (35%), and loss of disease activity control (35%).

Conclusion: Overall, patients reported satisfaction with switching from infliximab to infliximab-dyyb, but concerns regarding safety and efficacy were expressed. Patient involvement in the switching decision-making process may allay concerns and enhance biosimilar uptake.