The patent application relates to a method for producing crystalline idarubicin hydrochloride, comprising the steps of (i) preparing a mixture that contains (a) idarubicin hydrochloride, (b) at least one alcohol selected from the group consisting of 1-butanol, 2-butanol and 1-pentanol, and (c) water； and (ii) crystallization of idarubicin hydrochloride from said mixture.
