<qa>  What is the leading complication of post herpetic pain?Post herpetic pain is the leading complication of this disease with a higher risk in patients over 70 years causing a risk of autonomy loss. In fact, besides the disability of the pain itself, post herpetic pain often requires a combination of high-dose painkillers. The main therapeutic classes of analgesics used are antiepileptic in high doses Gabapentin, Pregabalin, tricyclic antidepressants amitriptyline, or opiates. The prevention with herpes zoster vaccine showed a reduction by 2 of risk and could therefore prevent addiction caused by induced recurrences of herpes zoster and treatment of post herpetic pain. 