# Moreau A, Dompmartin A, Dubreuil A, Leroy D: Phototoxic and photoprotective effects of topical isothipendyl. Photodermatol Photoimmunol Photomed. 1995 Apr;11(2):50-4. "Pubmed":http://www.ncbi.nlm.nih.gov/pubmed/8546983 (en)
Isothipendyl is a selective histamine H1 antagonist and binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine. (en)