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.
