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Fludarabine Phosphate

Last updated on: October 6, 2021

Drug Nomenclature

Fludarabine PhosphateSynonyms: 2-F-ara-AMP; 2-Fluoro-ara-AMP; Fludarabiinifosfaatti; Fludarabin-fosfát; Fludarabina, fosfato de; Fludarabine Monophosphate; Fludarabinfosfat; Fludarabini Phosphas; Fludarabino fosfatas; NSC-312887
BAN: Fludarabine Phosphate
USAN: Fludarabine Phosphate
INN: Fludarabine Phosphate [rINNM (en)]
INN: Fosfato de fludarabina [rINNM (es)]
INN: Fludarabine, Phosphate de [rINNM (fr)]
INN: Fludarabini Phosphas [rINNM (la)]
INN: Флударабина Фосфат [rINNM (ru)]
Chemical name: 9-β-d-Arabinofuranosyl-2-fluoroadenine 5´-dihydrogenphosphate
Molecular formula: C10H13FN5O7P =365.2
CAS: 21679-14-1 (fludarabine); 75607-67-9 (fludarabine phosphate)
ATC code: L01BB05

Note. The name FluCam has been used for a regimen of fludarabine with alemtuzumab. Distinguish from Flucam, which is ampiroxicam.

Pharmacopoeias. In Europe and US.

European Pharmacopoeia, 6th ed., 2008 and Supplements 6.1 and 6.2 (Fludarabine Phosphate). A white or almost white, hygroscopic, crystalline powder. Slightly soluble in water; very slightly soluble in dehydrated alcohol; freely soluble in dimethylformamide. Store in airtight containers at a temperature of 2° to 8°. Protect from light.

The United States Pharmacopeia 31, 2008 (Fludarabine Phosphate). A white to off-white, hygroscopic, crystalline powder. Slightly soluble in water and in 0.1M hydrochloric acid; practically insoluble in dehydrated alcohol; freely soluble in dimethylformamide. Store at 2° to 8°. Protect from light.

Adverse Effects, Treatment, and Precautions

For general discussions see Antineoplastics.

Fludarabine PhosphateBone-marrow suppression from fludarabine is dose-limiting, manifesting as neutropenia, thrombocytopenia, and anaemia; the nadir of the white cell and platelet counts usually occurs after about 13 to 16 days. Myelosuppression can be severe and cumulative; prolonged lymphopenia with concomitant risk of opportunistic infections may occur. Bone marrow hypoplasia or aplasia resulting in pancytopenia may sometimes be fatal.

Other common adverse effects include fever, fatigue, chills, cough, weakness, malaise, anorexia, gastrointestinal disturbances, mucositis, stomatitis, oedema, and skin rashes. Pulmonary toxicity, including pulmonary fibrosis, pneumonitis, and dyspnoea can occur. Other adverse effects include dysuria, haematuria, epistaxis, and abnormalities in hepatic or pancreatic enzymes. Tumour lysis syndrome has been reported, especially in patients with large tumour burdens. Autoimmune disorders, including auto-immune haemolytic anaemia, have been reported, and may be life-threatening or fatal.

Patients should be monitored for signs of haemolysis and therapy stopped if it occurs. Rarely reported effects include heart failure, arrhythmias, anaphylaxis, and haemorrhagic cystitis. Neurological disturbances include peripheral neuropathy, agitation, confusion, visual disturbances, hearing loss, headache, sleep disorders, and seizures; high doses have been associated with progressive encephalopathy, blindness, coma, and death.

Exacerbation of existing skin cancer lesions as well as new onset of skin cancer has been reported in some patients. Transfusion-associated graft-versus-host disease has been seen after transfusion of non-irradiated blood in patients treated with fludarabine, and fatalities have occurred; patients should only receive irradiated blood.

Dosage should be reduced in renal impairment (see below). It should also be avoided in patients with decom-pensated haemolytic anaemia.


A study in patients with chronic lymphocytic leukaemia who were treated with fludarabine found that there was no significantly increased risk of secondary malignancy following therapy, despite the immunosuppressive properties of this drug. A review of this and other studies concluded that no significant increase in the risk of secondary malignancy had been shown, but also that long-term follow-up of patients treated with fludarabine was needed.

Effects on the eyes

See under Effects on the Nervous System, below.

Effects on the lungs

Pulmonary toxicity manifest as dyspnoea, fever, hypoxaemia, and radiographic evidence of interstitial and alveolar infiltrates was diagnosed in 9 patients of a cohort of 105 treated with fludarabine. Lung biopsies were performed in 6 patients and showed diffuse chronic interstitial inflammation and fibrosis. Patients with chronic lymphocytic leukaemia appeared to be at greater risk of developing this complication than those with non-Hodgkin’s lymphoma.

Effects on the nervous system

High doses (of the order of 100mg/m daily intravenously) of fludarabine are associated with severe, life-threatening neurotoxicity. However, a few cases of progressive multifocal leukoencephalopathy have also been reported in patients given fludarabine in usual doses. The prolonged immunosuppression caused by fludarabine might increase the risk of developing this fatal demyelinating disease, which is caused by opportunistic JC virus infection. Ocular toxicity, including irreversible loss of vision, has also been reported occasionally, including with low-dose regimens.

Graft-versus-host disease

Transfusion-associated graft-versus-host disease has been reported when blood products were used in patients treated with fludarabine. Fludarabine-treated patients should receive irradiated red cells and platelets (to inactivate any viable T-cells) if they require a transfusion


A review of patients treated with fludarabine-containing regimens showed that therapy was associated with serious infections including listeriosis, pneumocystis pneumonia, mycobacterial infections, and opportunistic fungal and viral infections. The risk was exacerbated by previous or current corticosteroid therapy. Prophylactic therapy with co-trimoxazole, triazole antifungals, aciclovir, and colony-stimulating factors was recommended in at-risk patients. A high incidence of herpesvirus infections was also found in another review of patients treated with fludarabine.

Combination therapy using chlorambucil and fludarabine resulted in more infections than when either was used alone, but single-agent fludarabine was associated with more major infections and herpesvirus infections than chlorambucil alone. The frequency of serious infection has also been reported to be increased in patients after their conditions became refractory to fludarabine and they were being treated with conventional chemotherapy.

For reports of progressive multifocal leukoencephalopathy caused by opportunistic JC virus infection in patients receiving fludarabine, see Effects on the Nervous System, above.


Increased pulmonary toxicity, sometimes fatal, has been reported in patients given fludarabine with pentostatin. Pretreatment with cytarabine may reduce the metabolic activation of fludarabine, but pretreatment with fludarabine results in increased intracellular concentrations of cytarabine. The therapeutic efficacy of fludarabine may also be reduced by dipyridamole and other inhibitors of adenosine uptake.


Severe ototoxicity occurred when a short course of gentamicin was given to a patient who had recently completed a course of fludarabine.


For a suggestion that use of fludarabine with corticosteroids may increase the risk of infection, see Infection, above.


Intravenous fludarabine phosphate is rapidly dephosphorylated to fludarabine which is taken up by lymphocytes and rephosphorylated to the active triphos-phate nucleotide. Peak intracellular concentrations of fludarabine triphosphate are seen about 4 hours after a dose. Fludarabine has a bioavailability of about 50 to 65% after oral doses of the phosphate. Clearance of fludarabine from the plasma is triphasic with a terminal half-life of about 20 hours. Elimination is mostly via renal excretion: 60% of a dose is excreted in the urine. The pharmacokinetics of fludarabine exhibit considerable interindividual variation.

Uses and Administration

Fludarabine is a fluorinated nucleotide analogue of the antiviral vidarabine; it acts as a purine antagonist antimetabolite. It is used for its antineoplastic properties in the treatment of chronic lymphocytic leukaemia. Fludarabine phosphate is given by bolus injection or by intravenous infusion over 30 minutes in a usual dose of 25 mg/m daily for 5 consecutive days. Alternatively it may be given orally in a dose of 40 mg/m daily for 5 consecutive days. Courses may be repeated every 28 days, usually for up to 6 cycles. Haematological function should be monitored regularly; the dosage may need to be reduced, or further courses delayed, if blood counts indicate severe or persistent myelosuppression (see also Bone-marrow Depression). Doses should be reduced in renal impairment (see below).

Administration in renal impairment

Doses of fludarabine phosphate should be reduced by up to 50% in patients with mild to moderate renal impairment (creatinine clearance between 30 and 70 mL/minute); the drug should not be given in more severe renal impairment.

Malignant neoplasms

Fludarabine is the preferred second-line therapy for chronic lymphocytic leukaemia once initial alkylating agent therapy fails, and may also be used for initial therapy. It has also been tried in other malignancies. Listed below are some references to the use of fludarabine phosphate for the treatment of chronic lymphocytic leukaemia, and its potential activity against a variety of other malignancies, including indolent low-grade non-Hodgkin’s lymphoma, mycosis fungoides, heavy chain disease, prolym-phocytic leukaemia, hairy cell leukaemia, and Walden-strom’s macroglobulinaemia.


The United States Pharmacopeia 31, 2008: Fludarabine Phosphate for Injection; Fludarabine Phosphate Injection.

Proprietary Preparations

Argentina: Fludakebir; Fludara; Fluradosa; Forclina;

Australia: Fludara;

Austria: Fludara;

Belgium: Fludara;

Brazil: Fludara;

Canada: Fludara;

Chile: Fludara;

Czech Republic: Fludara; Tazumara;

Denmark: Fludara;

Finland: Fludara;

France: Fludara;

Germany; Fludara;

Greece: Fludara;

Hong Kong; Fludara;

Hungary: Fludara;

India: Fludara;

Indonesia: Fludara;

Ireland: Fludara;

Israel: Fludara;

Italy: Fludara;

Malaysia: Fludara;

Mexico: Beneflur; Fludara;

Netherlands: Fludara;

Norway: Fludara;

New Zealand: Fludara;

Philippines: Fludara;

Poland: Fludara;

Portugal: Fludara;

Russia: Fludara;

South Africa: Fludara;

Singapore: Fludara;

Spain: Beneflur;

Sweden: Fludara;

Switzerland: Fludara;

Thailand: Fludara;

Turkey: Fludara;

United Kingdom (UK): Fludara;

United States of America (US and USA): Fludara;

Venezuela: Fludara.

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