The invention discloses application of dihydromyricetin in preparing a
medicine for preventing and treating untoward reactions in radiotherapy and
chemotherapy of tumor. In particular, the application is to prepare medicines for preventing and treating untoward reactions in radiotherapy and
chemotherapy of tumor, preventing and treating arrest of
bone marrow and baldness, resisting
mutation, preventing and treating the generation of secondary tumors, preventing and treating tumor transfer, and preventing and treating
breast cancer,
cervical carcinoma,
intestinal cancer and the like. The invention creatively finds that the dihydromyricetin has the effects of removing free radicals, inhibiting reaction chains of the free radicals, resisting the
mutation, inhibiting the expression of the tumor
gene, causing the death of
tumor cells, preventing and treating the tumor generation, preventing and treating the secondary tumors and the transfer of the secondary tumors and preventing and treating infection. Therefore, as the
medicine for preventing and treating untoward reactions in radiotherapy and
chemotherapy of tumor, the dihydromyricetin can inhibit and alleviate chemical damage, prevent and treat damage of a
mutagen and further prevent
gene mutation or the secondary tumors; and by combination with the radiotherapy and chemotherapy, the effects of preventing untoward reactions in radiotherapy and chemotherapy of tumor and preventing generation of tumors are achieved.