Topical Therapy of Psoriasis With Mechlorethamine

Aqueous solutions of mechlorethamine (Mustargen) hydrochloride (0.055 to 0.00625%) have been used in courses of seven to ten days on lesions of psoriasis in 42 patients. A significant involutionary effect was obtained with the 0.0125% to 0.05% concentrations, particularly on the trunk. The rate of contact sensitization ranged from 50% to more than 80%, and was highest with the 0.05% concentration. Occasional Koebner reactions and paradoxical results were noted. The high rate of sensitization precludes the use of this agent in the practical management of psoriasis.