We have treated 48 cases of onychomycosis (of which 37 were caused by dermatophytes, 10 by yeasts and one by Scopulariopsis brevicaulis) with 200 mg ketoconazole daily. We obtained recovery in 65 p. 100 of the cases of onyxis caused by dermatophytes and in 80 p. 100 of the cases of onychomycosis due