Ningdong granule is a prescription used in traditional Chinese medicine. Researchers from Shandong University in China looked at its effectiveness in treating Tourette's syndrome. 64 children between seven and 18 were divided into two groups. One group took the granules while another group took a placebo. After eight weeks the participants taking the ningdong granule showed a 41.39% reduction in their total tic score while the placebo group showed only a 10.79% decrease. There were few side effects to the ningdong granules with one participant reporting loss of appetite and one constipation.
Zhao, L. ... [et al] - Traditional Chinese medicine ningdong granule: the beneficial effects in Tourette's disease The Journal of International Medical Research January/February 2010, 38(1), 169-175