It is a semisynthetic echinocandin used as an antifungal drug.anidulafungin has proven efficacy against esophageal candidiasis, but its main use will probably be in invasive candida infection- it may also have application in treating invasive aspergillus infection. it is a member of the class of antifungal drugs known as the echinocandins- its mechanism of action is by inhibition of (1 to 3)-beta-d-glucan synthase, an enzyme important to the synthesis of the fungal cell wall.