The present invention pertains to specific clonidine and/or clonidine derivatives for use in the prevention and/or treatment of adverse side effects of alkylating agent chemotherapy, other than those resulting from mucosal inflammation. It also pertains to the use of this clonidine and/or clonidine derivative for the manufacture of a pharmaceutical composition intended to prevent and/or alleviate the adverse side effects of alkylating agent chemotherapy, other than those resulting from mucosal inflammation. This invention is further directed to a kit comprising: (a) a clonidine and/or clonidine derivative, and (b) at least one alkylating chemotherapeutic agent, as a combined preparation for simultaneous, separate or sequential use in the treatment of cancer.
