Neuropathic pain is caused by nerve injury. Yokukansan (Yi-Gan San), a traditional Japanese (Kampo) medicine, has been widely used for neuropathic pain control. However, the analgesic mechanisms remain unknown. In this study, we investigated the analgesic mechanisms of yokukansan in a mouse model of neuropathic pain. Partial sciatic nerve ligation (PSL) induced mechanical allodynia in mice. Repetitive oral administration of the extracts of yokukansan and the constituent herbal medicine Atractylodis Lanceae Rhizoma, but not Glycyrrhizae Radix, relieved mechanical allodynia in the PSL mice and inhibited the PSL-induced expression of interleukin- (IL-) 6 mRNA in the spinal cord. Yokukansan did not attenuate intrathecal IL-6-induced mechanical allodynia. IL-6 immunoreactivity was detected in microglia and astrocytes in the spinal dorsal horn. These results suggest that yokukansan relieves mechanical allodynia in PSL mice by regulating the expression of IL-6 in astrocytes and/or microglia in the spinal cord. In addition, the components of Atractylodis Lanceae Rhizoma, one of the constituent herbal medicines in yokukansan, may play an important role in the regulation of IL-6 expression and neuropathic pain control.

We surveyed side effect incidences with Kampo therapies in 2530 patients based on their Kampo diagnoses. The number of side effects seen, including taste disorder, was 569 in 503 patients. Side effects were noted in 64 (3.0 ) of 2139 patients administered Glycyrrhizae radix. The average 63.4 13.8 age of these patients was statistically higher than the overall 54.9 18.1 year mean. Symptoms which led to diagnosis of side effects were high blood pressure in 45 patients, edema in 16 patients, and hypokalemia in only 5 patients. Glycyrrhizae radix dose as an extract was 2.0 1.0 (mean SD) g/day in 34 patients, and as a decoction was 2.2 1.1 g/ day in 29 patients. There was no difference in administration or recovery periods between these two groups. Liver dysfunction was noted in 13 (1.0 ) of 1328 patients administered prescriptions containing Scutellaria radix. Scutellaria radix was administered as an extract at 2.3 0.5 g/day in 7 patients, and as a decoction at 2.8 0.8 g/day in 6 patients. Although there was no difference in administration periods, the 69.0 52.5 day recovery period from side effects in the extract group was longer than that of 22.7 16.0 days in the decoction group. Symptom improvement was had for a large portion of these side effects with the first visit, indicating that initial diagnoses were correct. Care should be exercised with regard to inducing side effects, with Kampo medicines, even when using traditional diagnostic standards.Scutellaria Radix, Glycyrrhizae Radix, liver dysfunction, side effects, pseudoaldosteronism

Shoyogan is a Kampo prescription described in the Junqui Yaolue. Few cases have been reported using this medicine. This time, we prescribed shoyogan for 14 patients who suffered from severe appetite loss. We had positive outcomes as follows. We administered shoyogan to 8 patients with malignant disease. Six of them suffered from lung cancer. Shoyogan was effective in these patients. Shoyogan was not effective for the other 2 patients, with bile duct carcinoma and malignant lymphoma. The dietary intake was increased from 28 percent of meals supplied to 79 percent in the appetite-improved group. We also administered shoyogan to 6 patients with nonmalignant disease. It was effective for 3 patients : 1 with congestive heart failure and 2 with great trochanteric fractures of the femur. It was not effective for the other 3 patients, who suffered from anorexia, pneumonia and depression associated with diabetes mellitus. Shoyogan seems to be effective for patients with terminal lung cancer and maintains their quality of life. appetite, lung cancer, shoyogan, QOL

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