In this episode of Derms and Conditions, host James Q. Del Rosso, DO, is joined by Andy Blauvelt, MD, to explore the mechanism, efficacy, and safety of deucravacitinib, the first FDA-approved tyrosine kinase 2 (TYK2) inhibitor for psoriasis.

Dr Blauvelt begins by explaining how TYK2 inhibition differs from traditional JAK inhibition by targeting a more selective signaling pathway downstream of cytokine receptors. Unlike JAK1, JAK2, or JAK3, TYK2 is involved in a narrower range of cytokines, which may explain its distinct safety profile.

Dr Del Rosso and Dr Blauvelt also clarify why deucravacitinib lacks the boxed warning seen with other oral JAK inhibitors. With allosteric binding at the TYK2 pseudokinase domain, deucravacitinib avoids cross-inhibition of other JAKs, making it more selective and potentially safer. Long-term data now supports this distinction: 5-year safety results show no increased risk of major adverse cardiac events, malignancy, or serious infections, with only a small, manageable signal for herpesvirus infections.

The conversation turns to efficacy, which appears sustained over 5 years without antibody development, a potential advantage over biologics. Dr Blauvelt emphasizes its utility in high-impact areas such as the scalp, palms, soles, genitalia, and nails, and encourages systemic therapy even in patients with limited body surface area involvement when quality of life is severely affected.

Tune in to the full episode to learn how deucravacitinib fits into the current psoriasis treatment algorithm, what sets TYK2 inhibition apart from other oral options, and how real-world data is shaping clinical confidence in this novel therapy.