The author presents the drugs that are available for the treatment of opportunistic mycoses: amphotericin B, nystatin, 5-fluorocytosine, miconazole and the newest imidazole derivative econazole. He presents his experience with econazole in 4 cases with deep mycoses. He speaks of the mode of application and the therapeutical limits of these products as well as of the favorable factors and the prophylactic measures to be taken.