Xenon PharmaceuticalsXenon Pharmaceuticals Inc. announced that it has initiated a phase 2 clinical trial evaluating its novel topical XEN402 therapy for the treatment of PHN. XEN402 has been developed by Xenon as a topical ointment formulation and recently concluded a 21-day cumulative dose safety tolerability phase 1 study in normal human volunteers. The product was well tolerated and achieved good drug concentrations in the skin.

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