Started in Groningen in 2017, then hosted in Barcelona in 2018, in New York in 2021, in Hong Kong in 2023, we will be proud to host the 5th International Symposium on Photopharmacology in Montpellier in France in 2026. Photopharmacology aims at using photosensitive compounds combined with light irradiation to spatiotemporally control their structures and functions. This property allows for the use of light as an external control for therapeutic applications and research tools. Photopharmacology is a multidisciplinary field that integrates chemistry, biology, and pharmacology, which has been emerging rapidly in the recent years. However, more problems still need to be solved for the clinical translation of light-responsive materials. Bearing this in mind, the 5th International Symposium on Photopharmacology seeks to bring together world experts in photopharmacology to present, discuss, and collaborate between their own areas of expertise. Discipline scientifique :