Safety of tacrolimus 0.03% and 0.1% ointments in young children with atopic dermatitis: a 36‐month follow‐up study

Topical tacrolimus is used off-label in young children, but data are limited on its use in children under 2 years of age and for long-term treatment.To compare safety differences between topical tacrolimus (0.03% and 0.1% ointments) and topical corticosteroids (mild and moderate potency) in young children with atopic dermatitis (AD).We conducted a 36-month follow-up study with 152 young children aged 1-3 years with moderate to severe AD. The children were followed up prospectively, and data were collected on infections, disease severity, growth parameters, vaccination responses and other relevant laboratory tests were gathered.There were no significant differences between the treatment groups for skin-related infections (SRIs) (P = 0.20), non-SRIs (P = 0.20), growth parameters height (P = 0.60), body weight (P = 0.81), Eczema Area and Severity Index (EASI) (P = 0.19), vaccination responses (P = 0.62), serum cortisone levels (P = 0.23) or serum levels of interleukin (IL)-4, IL-10, IL-12, IL-31 and interferon-γ. EASI decreased significantly in both groups (P < 0.001). In the tacrolimus group, nine patients (11.68%) had detectable tacrolimus blood concentrations at the 1-week visit. There were no malignancies or severe infections during the study, and blood eosinophil counts were similar in both groups.Topical tacrolimus (0.03% and 0.1%) and topical corticosteroids (mild and moderate potency) are safe to use in young children with moderate to severe AD, and have comparable efficacy and safety profiles.