<qa>  What is the name of the drug that is given by IV?You may receive additional medication called CNS prophylaxis before receiving the study treatments. Your doctor will discuss these medications with you. The CNS prophylaxis consists of an alternating dose of either doxorubicin or methotrexate. The methotrexate will be given either by IV pump or by a lumbar puncture a needle inserted into the space between the vertebrae in your back to infuse the drug directly into the spinal area. The doxorubicin will be given by IV. Changes in the dose level of CNS prophylaxis will be approved if you are at risk for or are experiencing serious side effects. 