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.
In Chinese Medicine beriberi can be treated by one herbs that we have on record. Here is the list below.
Because it is a herb specifically indicated to treat beriberi as can be seen on Black Atractylodes Rhizome's page.
Its main actions are: Dries Damp and tonifies the Spleen. Relieves the Exterior for invasion of Wind-Cold-Damp. Relieves Wind-Damp painful obstruction. Dries Damp for either Damp-Cold or Damp-Heat when combined with the correct herbs. Clears the eyes and improves sight.