Abstract Background Vedolizumab (VDZ) is a selective biologic agent that is available in both intravenous (IV) and subcutaneous (SC) forms for maintenance treatment. The SC route offers advantages such as the convenience of self-administration, although some patients may prefer the IV route. The aim of our study was to determine patients’ preferences and satisfaction with their treatment when switching to VDZ SC or continuing with an IV administration. Methods A prospective, observational study was conducted in patients with inflammatory bowel disease (IBD) receiving VDZ IV who were in clinical remission. Patients had the option to continue with VDZ IV or switch to SC and were grouped according to their preference. A baseline visit (before the switch) and another at 24 weeks were conducted. During both visits, patients completed the treatment satisfaction questionnaire (SATMED-Q) and quality of life questionnaire (IBDQ9). Clinical activity, treatment adherence, adverse effects, general bloodwork, and fecal calprotectin were also analyzed. Results Forty-one IBD patients were included, 43% of which were women, and 63% had ulcerative colitis. Almost half (41%) continued with VDZ IV while 59% switched to SC. There were no differences in gender, type, or characteristics of IBD between the groups. However, the age of patients in the SC group was significantly younger than that of the IV group (median 46 [32-63] vs. 66 [59-77] p=0.03). Fewer patients in the SC group had previously received IV biologics (SC 31% vs. IV 69%, p=0.012). The median SATMED-Q before the switch was lower in the SC group (SC 53 [40-61] vs. IV 61 [46-64], p=0.032), as was the IBDQ9 (SC 65.5 [59.4-68.5] vs. IV 70.8 [68.5-77.1], p=0.037). At 24 weeks, there were no differences in SATMED-Q or IBDQ9 scores or disease clinical activity. Drug persistence and frequency of adverse events were similar in both groups. Vedolizumab levels increased significantly in the SC group at 24 weeks (p=0.041). Conclusion Switching to VDZ SC showed similar treatment satisfaction to VDZ IV at 24 weeks in IBD patients, with comparable clinical outcomes and safety profiles. There was a clear preference for subcutaneous administration among younger patients and those without previous IV treatment. This suggests that patient demographics and prior treatment experiences can influence the choice of administration route. The lack of significant differences in clinical outcomes, quality of life scores, and treatment satisfaction between the SC and IV groups at 24 weeks highlights the clinical equivalence of these two administration routes for maintenance therapy in IBD.
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