Figure 4From: The impact of herpes zoster and post-herpetic neuralgia on quality-of-life Number needed to treat with common pain therapies to obtain 50% pain relief in one patient [68]. Data highlight the limited relief from pain obtained in patients with post-herpetic neuralgia (PHN). For some treatments, approximately four patients with PHN need to be treated to achieve 50% pain relief in one patient.Back to article page