This medicine is an antimetabolite used to treat certain types of cancer. It may also be used to treat other conditions as determined by your doctor.

Before using
Some medicines or medical conditions may interact with this medicine. INFORM YOUR DOCTOR OR PHARMACIST of all prescription and over-the-counter medicine that you are taking. ADDITIONAL MONITORING OF YOUR DOSE OR CONDITION may be needed if you are taking allopurinol, warfarin, anticoagulants, certain drugs to treat ulcerative colitis (e.g., olsalazine, mesalazine, sulfasalazine), or medicine for seizures. Inform your doctor of any other medical conditions, allergies, pregnancy, or breast-feeding. Contact your doctor or pharmacist if you have any questions or concerns about taking this medicine.

Directions
Follow the directions for using this medicine provided by your doctor. DRINK PLENTY OF LIQUIDS as directed by your doctor. STORE THIS MEDICINE at room temperature below 77 degrees F (25 degrees C) in a tightly-closed container, away from heat and light. IF YOU MISS A DOSE OF THIS MEDICINE, skip the missed dose and go back to your regular dosing schedule. DO NOT take 2 doses at once.

Cautions
KEEP ALL DOCTOR AND LABORATORY APPOINTMENTS while you are being treated with this medicine. BEFORE YOU BEGIN TAKING ANY NEW MEDICINE, either prescription or over-the-counter, check with your doctor or pharmacist. THIS MEDICINE LOWERS YOUR RESISTANCE to infection. To prevent infection, avoid contact with people who have colds or other infections. Do not touch your eyes or the inside of your nose unless you have thoroughly washed your hands first. THIS MEDICINE MAY REDUCE THE NUMBER OF BLOOD CELLS NEEDED FOR CLOTTING. To prevent bleeding, avoid situations where bruising or injury may occur. THIS MEDICINE MAY CAUSE LIVER PROBLEMS. Drinking alcohol while taking this medicine may increase the risk of liver problems. Discuss drinking alcohol with your doctor. CHECK WITH YOUR DOCTOR BEFORE HAVING IMMUNIZATIONS (VACCINATIONS) while you are using this medicine. THIS MEDICINE HAS BEEN SHOWN TO CAUSE HARM to the human fetus. IF YOU PLAN ON BECOMING PREGNANT, discuss with your doctor the benefits and risks of using this medicine during pregnancy. IT IS UNKNOWN IF THIS DRUG IS EXCRETED in breast milk. DO NOT BREAST-FEED while taking this medicine.