Liu Wei Di Huang Wan cannot cure postherpetic neuralgia. Herpes belongs to snake string sores in Chinese medicine, Liu Wei Di Huang Wan is a drug that nourishes kidney yin, postherpetic neuralgia is related to stasis and blood stagnation, take Tao Hong Si Wu Tang. It should not be taken for cold and fever, the adverse effects are not exact. The pain after the rash of snake string sores subsides is not related to kidney yin deficiency, and is related to stasis and blood stagnation, and can be taken with Taohong Si Wu Tang, the drugs are safflower, licorice, red peony, peach kernel, chuanxiong, and shengdi, the adverse effects and contraindications are not exact. Taking the above medications requires medical supervision.