Real‐world experience of baricitinib in atopic dermatitis: including add‐on therapy for patients using dupilumab

Abstract Background Little real‐world experience regarding the use of baricitinib, an oral selective JAK1/JAK2 inhibitor, for treating moderate to severe atopic dermatitis (AD) has been reported. Methods This study aimed to assess the overall outcomes in Korean patients with AD treated with baricitinib. All patients with moderate to severe AD treated with baricitinib between June 2021 and June 2022 were included, and their cases were retrospectively analyzed using medical records. Patients with moderate to severe AD, aged ≥18 years who had failed previous therapies, including those who demonstrated unsatisfactory improvement with dupilumab, were prescribed baricitinib. Patients whose follow‐up period was <8 weeks were excluded. The dermatologist evaluated the AD status, including eczema area and severity index (EASI), itch Numeric Rating Scale, and improvement of remaining lesions despite dupilumab therapy. Results We analyzed 34 AD patients who received baricitinib. Twelve patients treated with dupilumab were additionally prescribed baricitinib due to unsatisfactory treatment effects and demonstrated improvement in the remaining lesions despite dupilumab treatment. Their itching improved after 1.4 weeks. Among them, eight patients (66.7%) had head and neck dermatitis, and seven of them demonstrated improvement after the coadministration of baricitinib. Among the other 22 patients who were prescribed baricitinib only, 10 patients (45.5%) achieved EASI 75 at 8 weeks, with five (22.7%) revealing EASI 90. Conclusions Overall, baricitinib was well tolerated and resulted in clinical improvement in AD patients in a real‐world clinical setting. Additionally, baricitinib may be beneficial in treating lesions refractory to dupilumab therapy.