PK of Lidocaine/Tetracaine and PD Derived From a New Topical Formulation for Treatment of Neuropathic Pain.

"Patients who agree to participate, will be given the Lidocaine 23%/Tetracaine 7% formulation. The application of the cream will be carried out by a researcher in charge:~1. A skin area of 200 cm2 will be delimited for the application of the formulation throughout the study period.~2. 10 grams will be applied every 12 hours for a period of 48 hours."