Kudzu’s root, flower, and leaf are used to make medicine. It has been used in Chinese medicine since at least 200 BC. As early as 600 AD, it was used to treat alcoholism. Today, kudzu is used to treat alcoholism and to reduce symptoms of alcohol hangover, including headache, upset stomach, dizziness, and vomiting.o side effects have been reported in clinical studies when kudzu is taken by mouth. There is, however, one case report of allergic reaction following use of a combination herbal product containing kudzu (Kakkonto). Another report suggests that taking kudzu root by mouth might cause liver damage.