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Systematic (IUPAC) name
5-(6-amino-2-chloro-purin-9-yl) -4-fluoro-2- (hydroxymethyl)oxolan-3-ol
Clinical data
Trade names Clolar, Evoltra
AHFS/ Monograph
MedlinePlus a607012
Routes of
Legal status
Legal status
  • ℞ (Prescription only)
CAS Number 123318-82-1 YesY
ATC code L01BB06 (WHO)
PubChem CID 119182
DrugBank DB00631 YesY
ChemSpider 106472 YesY
KEGG D03546 YesY
ChEBI CHEBI:681569 YesY
Chemical data
Formula C10H11ClFN5O3
Molar mass 303.677 g/mol

Clofarabine is a purine nucleoside antimetabolite marketed in the US and Canada as Clolar. In Europe and Australia/New Zealand the product is marketed under the name Evoltra. It is FDA-approved for treating relapsed or refractory acute lymphoblastic leukaemia (ALL) in children after at least two other types of treatment have failed. It is not known if it extends life expectancy. Some investigations of effectiveness in cases of acute myeloid leukaemia (AML) and juvenile myelomonocytic leukaemia (JMML) have been carried out. Ongoing trials are assessing its efficacy, if any, for managing other cancers.

Side effects[edit]

  • Tumor lysis syndrome (TLS). Clofarabine quickly kills leukaemia cells in the blood. The body may react to this. Signs include hyperkalemia, hyperuricemia, and hyperphosphatemia. TLS is very serious and can lead to death if it is not treated right away.
  • Systemic inflammatory response syndrome (SIRS): symptoms include fast breathing, fast heartbeat, low blood pressure, and fluid in the lungs.
  • Bone marrow problems (suppression). Clofarabine can stop the bone marrow from making enough red blood cells, white blood cells, and platelets. Serious side effects that can happen because of bone marrow suppression include severe infection (sepsis), bleeding, and anemia.
  • Effects on pregnancy and breastfeeding. Girls and women should not become pregnant or breastfeed during treatment which may harm the baby.
  • Dehydration and low blood pressure. Clofarabine can cause vomiting and diarrhea which may lead to low body fluid (dehydration). Signs and symptoms of dehydration include dizziness, lightheadedness, fainting spells, or decreased urination.
  • Other side effects. The most common side effects are stomach problems (including vomiting, diarrhea, and nausea), and effects on blood cells (including low red blood cells count, low white blood cell count, low platelet count, fever, and infection. Clofarabine can also cause tachycardia and can affect the liver and kidneys.


  • pregnancy or planned pregnancy
  • breast-feeding
  • liver problems
  • kidney problems

Drug interactions[edit]

  • nephrotoxic drugs
  • hepatotoxic drugs


  • By intravenous infusion.
  • Dosage is a 2-hour infusion (52 mg/m²) every day for five days. The cycle is repeated every 2 to 6 weeks.
  • Regular blood tests to monitor his or her blood cells, kidney function, and liver function.


Clolar was Food and Drug Administration (FDA) approved 28 December 2004. (Under accelerated approval regulations requiring further clinical studies.)

External links[edit]