FIELD : medicine. SUBSTANCE : invention relates to medicine, in particular to a rapidly disintegrating oral composition of Ketorolac and a method for treating pain with a fast-disintegrating composition. Rapidly decomposing composition contains an effective amount of ketorolac, a water-insoluble polymer, and sugar alcohol in an amount of from 20? to 50? by weight of the composition. Method for treating pain involves administering a fast-disintegrating composition to a patient, while the composition provides the plasma anesthetic substance concentration of about 370爊g/ml in less than 10爉inutes. EFFECT : implementation of the invention allows to obtain a composition that provides effective treatment of pain, rapid onset of action and a high rate of ketorolac at the initial time, with the minimum effective concentration. 28 cl, 1 dwg, 8 ex, 8 tbl