Neurologic: Headache.
Serious: Dermatologic: Erythema multiforme, Stevens-Johnson syndrome.
Hematologic: Agranulocytosis (less than 1%), aplastic anemia, granulocytopenic disorder (less than 1%), leukopenia (less than 1%), pancytopenia (less than 1%), thrombocytopenia (less than 1%).
Hepatic: Hepatotoxicity, with elevated liver enzymes.
Renal: Acute renal failure (rare).
Susp: Gastrointestinal disturbance, headache, dizziness.
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