<prompt> The following drug is effective in treatment of ptyriasis versicolorKetoconazoleMetronidazoleGriseofulvinChloroquine  <response>: Treatment of P. versicolorSystemic Ketoconazole, Fluconazole, Itraconazole.Topical Azoles clotrimazole, econazole, micronazole, ketoconazole, selenium sulfide, sodium thiosulphate, whitfields ointment 3 salicylic acid 6 benzoic acid. 