Dupilumab after the 2017 approval for the treatment of atopic dermatitis: what's new and what's next? Purpose of review The IL-4/13 antagonist dupilumab was approved in 2017 as the first biologic for atopic dermatitis. Here, we comprehensively review compelling new data regarding dupilumab published following the approval. Recent findings Daily clinical practice reports of dupilumab in atopic dermatitis are favorable and in line with the registration trials. Dupilumab does not appear to negatively affect pharmacokinetics of CYP450-metabolized drugs nor vaccination responses. Type 2 inflammation biomarkers in skin and serum are reduced following dupilumab treatment. Dupilumab increases the risk for conjunctivitis, especially with higher baseline atopic dermatitis severity and a history of conjunctivitis, but the underlying mechanisms are unknown. Favorable effects of dupilumab have been reported in treatment-recalcitrant hand eczema and prurigo nodularis cases; for allergic contact dermatitis and alopecia areata, there are conflicting responses to dupilumab, possible stemming from pathophysiological heterogeneity. Summary Daily practice data support the continued use of dupilumab for atopic dermatitis. The only safety signal is an increased risk for conjunctivitis; mechanistic studies into dupilumab-associated conjunctivitis should lead to risk mitigation strategies. Prospective, controlled evaluations are needed for dupilumab in hand eczema and prurigo nodularis. A precision medicine-driven drug-development approach is essential to assess dupilumab for diseases with heterogeneous pathophysiologies, such as alopecia areata and allergic contact dermatitis. Correspondence to Deepak M.W. Balak, MD, PhD, MSc, National Expertise Center for Atopic Dermatitis, Department of Dermatology and Allergology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. Tel: +31 88 75 739 37; e-mail: d.m.w.balak@umcutrecht.nl Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.