Mebhydrolin napadisylate (mehydraline) ndi mankhwala a antihistamine, omwe amadziwikanso kuti m'badwo woyamba wa antihistamine H1 receptor antagonist. Ntchito yake yayikulu ndikuletsa kutulutsidwa kwa histamine m'thupi, potero kuchepetsa zizindikiro zomwe zimayambitsidwa ndi matupi awo sagwirizana, monga kuyetsemula, mphuno yothamanga, maso amadzi, kuyabwa, etc.