Mebhydrolin napadisylate (mehydraline) maganin antihistamine ne, wanda kuma aka sani da ƙarni na farko na antihistamine H1 antagonist. Babban aikinsa shi ne hana fitar da histamine a jiki, ta yadda za a rage alamun rashin lafiyan da ke haifar da shi, kamar atishawa, zub da hanci, ruwan ido, kaikayi da sauransu.