The following serious adverse reactions are discussed in greater detail in other sections of the labeling: Delayed myelosuppression Risks of overdosage Pulmonary toxicity Secondary malignancies Hepatotoxicity Nephrotoxicity The following adverse reactions associated with the use of lomustine were identified in clinical trials or postmarketing reports. Because these reactions were reported from a population of uncertain size, it is not possible to estimate their frequency, reliability, or establish a causal relationship to drug exposure. Gastrointestinal disorders: nausea, vomiting, and stomatitis Ocular disorders: optic atrophy, visual disturbances, and blindness Neurologic disorders: disorientation, lethargy, ataxia, and dysarthria Other: alopecia Common adverse reactions include delayed myelosupression, nausea, vomiting, stomatitis, and alopecia.