The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Because it is a herb specifically indicated to treat alcoholism as can be seen on Kudzu Root's page.
Its main actions are: Relieves muscle tension especially in the neck and shoulders. Relieves the Exterior and scatters Wind. Supports the Fluids and eases thirst. Assists in the expression of measles. Relieves diarrhea. Relieves hypertension.