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Generic Name: clofarabine (kloe FAR a been)
Brand Names: Clolar
Clolar is a cancer medication used to treat acute lymphoblastic leukemia. Learn about side effects, interactions and indications.
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Drug Information:
Clolar (clofarabine) is a cancer medicine that interferes with the growth and spread of cancer cells in the body. Clolar is used to treat acute lymphoblastic leukemia (a type of blood cancer) in children and young adults up to 21 years old. Clolar is usually given after other cancer medicines have been tried without successful treatment. Clolar can cause life-threatening side effects including: serious infection, severe skin rash, internal bleeding, and liver or kidney damage. Call your doctor right away if you have: fever, chills, unusual bleeding or bruising, urination problems, stomach pain or swelling, loss of appetite, bloody diarrhea, coughing up blood, sudden numbness or severe headache, problems with vision or balance, or sudden swelling in your arms, legs and other parts of the body. Learn more

Clolar Side Effects

Clolar Side Effects

Note: This document contains side effect information about clofarabine. Some of the dosage forms listed on this page may not apply to the brand name Clolar.

In Summary

Common side effects of Clolar include: febrile neutropenia, herpes simplex infection, infection, oral candidiasis, pericardial effusion, pleural effusion, pneumonia, respiratory distress, sepsis, staphylococcal infection, abdominal pain, anxiety, arthralgia, back pain, cellulitis, confusion, constipation, cough, depression, dermatitis, diarrhea, dizziness, drowsiness, dyspnea, edema, epistaxis, erythrodysesthesia syndrome, fatigue, fever, gingival hemorrhage, headache, hematuria, hepatomegaly, hypertension, hypotension, jaundice, lethargy, limb pain, mucositis, myalgia, nausea, neutropenia, pain, petechia, pruritus, rigors, sore throat, tachycardia, transfusion reaction, tremor, vomiting, weight loss, anorexia, bacteremia, decreased appetite, erythema of skin, flushing, irritability, pain at injection site, and xeroderma. Other side effects include: increased serum creatinine. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to clofarabine: intravenous solution

Along with its needed effects, clofarabine (the active ingredient contained in Clolar) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking clofarabine:

More common

  • Abdominal or stomach pain or tenderness
  • area rash
  • black, tarry stools
  • bleeding gums
  • blood in the urine or stools
  • bloody nose
  • blurred vision
  • burning or stinging of the skin
  • chest pain
  • chills
  • clay-colored stools
  • cold or flu-like symptoms
  • confusion
  • cough or hoarseness
  • dark urine
  • decreased urine output
  • diarrhea
  • difficult or labored breathing
  • dilated neck veins
  • dizziness
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • facial swelling
  • fainting
  • fast, pounding, or irregular heartbeat or pulse
  • feeling of warmth
  • fever
  • flushing, redness of the skin
  • headache
  • irregular breathing
  • itching in the genital area
  • itching or skin rash
  • joint pain, stiffness, or swelling
  • lightheadedness
  • loss of appetite
  • lower back or side pain
  • nausea
  • nervousness
  • pain
  • painful cold sores or blisters on the lips, nose, eyes, or genitals
  • painful or difficult urination
  • pale skin
  • pinpoint red spots on the skin
  • pounding in the ears
  • rapid, shallow breathing
  • redness of the face, neck, arms, and occasionally, upper chest
  • redness, swelling, or skin pain
  • scaling of the skin on the hands and feet
  • severe abdominal or stomach cramps with pain
  • slow or fast heartbeat
  • small red or purple spots on the skin
  • sneezing
  • sore throat
  • sores, ulcers, or white spots on the lips or in the mouth
  • sweating
  • swelling of the ankles, feet, or lower legs
  • swelling or inflammation of the mouth
  • swollen glands
  • tenderness
  • tightness in the chest
  • tingling of the hands and feet
  • troubled breathing with exertion
  • ulcers, sores, or white spots in the mouth
  • unpleasant breath odor
  • unusual bleeding or bruising
  • unusual tiredness or weakness
  • unusually warm skin
  • vomiting
  • vomiting of blood
  • warmth on the skin
  • watery and severe diarrhea, which may also be bloody
  • weight gain
  • yellow eyes or skin

Less common

  • Agitation
  • bloating
  • blue lips and fingernails
  • chest pain or discomfort
  • cloudy urine
  • constipation
  • coughing that sometimes produces a pink frothy sputum
  • darkened urine
  • decrease or increase in the amount of urine
  • decreased level of consciousness
  • depression
  • difficult, fast, or noisy breathing, sometimes with wheezing
  • dry mouth
  • general feeling of discomfort or illness
  • hives
  • hostility
  • hyperventilation
  • increased sweating
  • indigestion
  • irritability
  • muscle aches and pains
  • muscle twitching
  • pain or tenderness around the eyes and cheekbones
  • pains in the stomach, side, or abdomen, possibly radiating to the back
  • rapid weight gain
  • restlessness
  • seizures (convulsions)
  • shaking
  • shivering
  • stuffy or runny nose
  • swelling of the eyelids, face, lips, or hands
  • trouble sleeping

Incidence not known

  • Blistering, peeling, or loosening of the skin
  • red irritated eyes
  • red skin lesions, often with a purple center

Some side effects of clofarabine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Back pain
  • bone pain
  • bruises on the skin
  • cracked lips
  • difficulty with moving
  • difficulty with swallowing
  • discouragement
  • dry skin
  • fear
  • feeling sad or empty
  • feeling unusually cold
  • injection site pain
  • itching, pain, redness, swelling, tenderness, or warmth on the skin at the injection site
  • lack or loss of strength
  • loss of interest or pleasure
  • muscle pain or stiffness
  • pain in the limbs
  • pain in the rectum
  • right upper stomach pain and fullness
  • skin discoloration
  • sore mouth or tongue
  • swollen joints
  • tiredness
  • trouble concentrating
  • unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
  • unusually warm skin
  • weight loss
  • white patches with diaper rash

For Healthcare Professionals

Applies to clofarabine: intravenous solution


Very common (10% or more): Vomiting (78%), nausea (73%), diarrhea (56%), abdominal pain (35%), gingival or mouth bleeding (17%), mucosal inflammation (16%)

Common (1% to 10%): Upper abdominal pain, oral mucosal petechiae, proctalgia, stomatitis, cecitis, pancreatitis

Postmarketing reports: GI hemorrhage (including fatalities)


Very common (10% or more): Pyrexia (39%), chills (34%), fatigue (34%), pain (15%), edema (12%), asthenia (10%)


Very common (10% or more): Leukopenia (88%), anemia (83%), lymphopenia (82%), thrombocytopenia (81%), neutropenia (64%), febrile neutropenia (55%), nonfebrile neutropenia (10%)


Very common (10% or more): Pruritus (43%), rash (38%), petechiae (26%), palmar-plantar erythrodysesthesia syndrome (16%), erythema (11%)

Common (1% to 10%): Rash pruritic

Postmarketing reports: Stevens-Johnson Syndrome (SJS), toxic epidermal necrolysis (TEN) (including fatal cases)

Nervous system

Very common (10% or more): Headache (43%), anxiety (21%), lethargy (10%), somnolence (10%)

Common (1% to 10%): Agitation


Very common (10% or more): SGPT elevated (81%), SGOT elevated (74%), bilirubin elevated (45%)

Common (1% to 10%): Jaundice, hyperbilirubinemia


Very common (10% or more): Tachycardia (35%), hypotension (29%), flushing (19%), hypertension (13%)

Common (1% to 10%): Pericardial effusion


Very common (10% or more): Epistaxis (27%), dyspnea (13%), pleural effusion (12%), pneumonia (10%), respiratory distress (10%), respiratory syncytial virus infection, sinusitis

Common (1% to 10%): Upper respiratory tract infection, tachypnea, pulmonary edema


Very common (10% or more): Pain in extremity (34%), myalgia (16%), back pain (12%), bone pain (11%)

Common (1% to 10%): Arthralgia


Very common (10% or more): Irritability (11%)

Common (1% to 10%): Mental status change


Very common (10% or more): Hematuria (13%)


Very common (10% or more): Creatinine elevated (50%)


Common (1% to 10%): Tumor lysis syndrome


Common (1% to 10%): Hypersensitivity


Very common (10% or more): Sepsis, including septic shock (17%), catheter related infection (12%), herpes simplex (10%)

Common (1% to 10%): Clostridium colitis, bacteremia, staphylococcal bacteremia, staphylococcal sepsis, candidiasis, cellulitis, herpes zoster, oral candidiasis, bacterial infection, enterococcal bacteremia, escherichia bacteremia, escherichia sepsis, fungal infection, fungal sepsis, gastroenteritis adenovirus, infection, influenza, parainfluenza virus infection, pneumonia fungal, pneumonia primary atypical, staphylococcal infection


Very common (10% or more): Anorexia (30%)

Postmarketing reports: Hyponatremia

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Clolar