<p>There has been no experience with acute overdosage in humans. The maximal tolerated dose in patients with myelodysplastic syndrome or solid tumors was 195 mg/m2 /day. The maximal tolerated dose in pediatric patients was lower at 60 mg/m2 /day. Overdosage with other retinoids has been associated with transient headache, facial flushing, cheilosis, abdominal pain, dizziness and ataxia. These symptoms have quickly resolved without apparent residual effects. There is no specific treatment in the case of an overdose, however, it is important that the patient be treated in a special hematological unit.</p>