Objectives : The present study was made to evaluate the clinical effectiveness of Saengmaeg-san (生脈散) extract to treat xerostomia in stroke patients. Methods : The study design was a double-blind randomized controlled trial. Subjects were stroke patients with xerostomia. They were allocated to either the Saengmaeg-san (n=12) or placebo group (n=12). Saengmaeg-san extract or a placebo in similar opaque capsules was given three times a day for a week. The improvement of xerostomia was measured by the xerostomia-evaluating questionnaire, developed by the school of dentistry in Seoul National University, before baseline and one week later. Eleven of the Saengmaeg-san group and ten of the placebo group finished the trial and were analyzed. Paired samples t-test and Mann-Whitney test were applied to statistical analysis. Results : On three of the six questions, the Saengmaeg-san group improved significantly. On two of the six questions, the Saengmaeg-san group improved significantly more than the placebo group. On the other questions, the Saengmaeg-san group improved more than the placebo group, although significance was not reached. Conclusions : These results demonstrate that Saengmaeg-san extract is effective for treating xerostomia in stroke patients, and further studies should be conducted to provide more valuable information.