The use of 0.25% zinc pyrithione spray does not enhance the efficacy of clobetasol propionate 0.05% foam in the treatment of psoriasis.
Housman TS, Keil KA, Mellen BG, McCarty MA, Fleischer AB, Feldman SR. The use of 0.25% zinc pyrithione spray does not enhance the efficacy of clobetasol propionate 0.05% foam in the treatment of psoriasis. J Am Acad Dermatol. 2003 Jul; 49(1):79-82.