FDA approves Stelara biosimilar Otulfi (ustekinumab-aauz) for Crohn’s disease, ulcerative colitis, moderate to severe plaque psoriasis, and active psoriatic arthritis. Otulfi, available in subcutaneous and intravenous formulations, targets interleukin-12 and interleukin-23. It will launch in the U.S. by Feb. 22, 2025, and is also approved in the EU. Common adverse reactions include nasopharyngitis, upper respiratory tract infection, headache, and fatigue.