Dose-related bone marrow toxicity reported (use caution in myelosuppression). Development of neurologic disorders (use with caution in history of seizure disorder or compromised CNS function). Flu-like symptoms (at higher doses) may exacerbate pre-existing cardiovascular disorders (including ischemia, heart failure, or arrhythmias). May cause hepatotoxicity (increased incidence in children <1 year of age). Hypersensitivity reactions reported (rarely). Transient cutaneous rashes may occur. Use with caution in cardiovascular disease.