AUTHOR=Mujtaba Md Ali , Rashid Md Abdur , Godbole Mangesh D. , Alhamhoom Yahya , Shende Divyashri S. , Alshehri Sameer , Akbar Mohammad J. , Kaleem Mohammed , Mahajan Ujwala N. , Shahzad Naiyer TITLE=Escitalopram oxalate-loaded chitosan nanoparticle in situ gel formulation intended for direct nose-to-brain delivery: in vitro, ex vivo, and in vivo pharmacokinetic evaluation JOURNAL=Frontiers in Pharmacology VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2025.1577331 DOI=10.3389/fphar.2025.1577331 ISSN=1663-9812