Xiao Yao Wan is a traditional Chinese herbal formula that is commonly used to treat stress, anxiety, and depression. It can also be used to regulate menstrual cycles and relieve premenstrual syndrome (PMS) symptoms. Xiao Yao Wan is traditionally used to soothe liver qi stagnation and harmonize the body's energy. The formula can be used for stress, anxiety, depression, and irritability. Xiao Yao Wan can also be used for menstrual irregularities, such as PMS or menstrual cramps.