- Cytarabine (ara-C) 2,000 mg/m2 IV over 2 h q 12 h x 8 doses Days 1-4. Cytarabine dosage should be based on corrected weight, calculated as follows: Ideal weight + 25% of the difference between actual and ideal weight. If actual weight is less than ideal weight, use actual weight.Begin concurrent with etoposide infusion. Cytarabine doses should be mixed in 250 ml of D5W.