This medication decreases bone marrow function, an effect that may lead to a low number of blood cells such as red cells, white cells, and platelets. This effect can cause anemia, decrease your body's ability to fight an infection, or cause easy bruising/bleeding. Tell your doctor right away if you develop any of the following symptoms: unusual tiredness, pale skin, signs of infection (such as sore throat that doesn't go away, fever, chills), easy bruising/bleeding.

Nausea, vomiting, loss of appetite, diarrhea, headache, dizziness, mouth sores, and pain/swelling/redness at the injection site may occur. Nausea and vomiting can be severe. In some cases, drug therapy may be needed to prevent or relieve nausea and vomiting. Not eating before your treatment may help relieve vomiting. Changes in diet such as eating several small meals or limiting activity may help lessen some of these effects. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Temporary hair loss may occur. Normal hair growth should return after treatment has ended. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: signs of liver problems (such as nausea/vomiting that doesn't stop, stomach/abdominal pain, dark urine, yellowing eyes/skin), muscle/bone pain, chest pain, shortness of breath, eye redness/itching/pain, vision problems (including blindness), painful/difficult swallowing, anal sores, signs of kidney problems (such as change in the amount of urine), painful/difficult urination, joint/side/back pain, numbness or tingling of hands/feet, freckling, big toe pain, black/bloody stools, vomit that looks like coffee grounds, mental/mood changes (such as confusion, unusual drowsiness), enlarged abdomen, muscle weakness, loss of coordination, inability to move (paralysis), seizures. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products that may interact with this drug include: digoxin, flucytosine, gentamicin.