A composition including Cuscuta japonica Choisy extract, or the extract of Rehmannia glutinosa Libschitz var. purpurea MAKINO and Cuscuta japonica Choisy is provided. The composition, which can be a pharmaceutical or food composition, is useful for for preventing, ameliorating, or treating hearing loss. A method for ameliorating, preventing, or treating hearing loss, in particular, acoustic trauma, temporary or permanent hearing loss by effectively inhibiting the threshold shift induced by noise and the likes is disclosed.