Carbamazepine can be used to treat postherpetic neuralgia under the supervision of a physician. Posterior neuralgia generally refers to postherpetic neuralgia, which is secondary to herpes zoster. When herpes disappears > 1 month, the local skin and mucous membranes still have severe and prolonged pain, affecting work and life, can be treated with carbamazepine. The drug is effective in relieving nerve pain by decreasing the excitability of nerve cells, which in turn reduces the frequency of pain. Side effects of carbamazepine include dizziness, headache, drowsiness, fatigue, blurred vision, nausea, vomiting, dry mouth and itchy skin; caution for drivers, pilots, coronary heart disease, hepatic and renal insufficiency, children and diabetes mellitus; and contraindicated in pregnancy and maternity, allergy, and severe mental disorders. Patients with postural neuralgia are advised to consult a doctor and use the medication in strict compliance with the doctor’s instructions to avoid adverse consequences.