Nonchemotherapeutic drugs may also cause pulmonary parenchymal alterations. Mechanisms of pulmonary damage by these agents are diverse and may involve alterations of pulmonary homeostasis. Clinical features of noncytotoxic, drug-induced pulmonary disease are more heterogenous than those associated with cytotoxic drugs, and several clinical syndromes are equally represented. Treatment and outcome vary with each individual drug and clinical presentation. In part 2, clinical and pathogenic aspects of noncytotoxic, drug-induced pulmonary disease are discussed.