The following full-text article is available in a service called "Open Access" at Biomed Central:
Tolerability of NGX-4010, a capsaicin 8% dermal patch, following pretreatment with lidocaine 2.5%/prilocaine 2.5% cream in patients with post-herpetic neuralgia
See: http://www.biomedcentral.com/1471-2253/11/25/abstract
The service itself pre-publishes research in the neuro sciences, and may be worth subscribing to (It's free).
Regards, Red