Additive myelosuppression with other myelosuppressive agents. Cytotoxic agents may increase risk of pulmonary toxicity. May reduce response to vaccines, possibility of generalised infections with live vaccines. Increased risk of adverse effects if given in conjunction with or soon after radiotherapy. Decreased clearance when used wit cyclophosphamide, itraconazole or paracetamol. Combination with thioguanine may result in oesophageal varices, hepatotoxicity and portal HTN. Increased clearance by phenytoin.
Bone marrow depression, manifested as leucopenia, thrombocytopenia and anaemia; hyperpigmentation, GI disturbances, impaired fertility and gonadal function. Rarely, dry skin, gynaecomastia, cataract formation, at high doses, CNS effects including convulsions.
Pregnancy Category D. There is positive evidence of human foetal risk, but the benefits from use in pregnant women may be acceptable despite the risk
Discontinue if lung toxicity develops. Severe hepatic or renal impairment. Pregnancy and lactation.
