Kampo Medicine for Essential Voice Tremor.

Voice tremor is a common symptom in the elderly, as well as in patients who have had Parkinson's disease and related disorders, and other neurologic conditions. In this study, we analyzed 26 patients whose essential tremor symptoms involved phonation alone and were treated in our clinic alone as essential voice tremor. Kampo medicine yokukansan was found to be effective in the treatment of essential voice tremor compared with clonazepam. We suggest that yokukansan may be one of the best choices for first-line treatment of essential voice tremor.