Do not breastfeed while you are being given this medicine.
Before you start your treatments, tell your doctor if you have any infections, bone marrow problems, or liver or kidney disease.
You may get infections more easily while getting this medicine. Stay away from crowds or people with colds, flu, or other infections.
This medicine may make your mouth sore and irritated. Keep your mouth clean to prevent infection. Brush your teeth with a soft-bristle toothbrush or mouth swab.
This medicine can cause nausea and vomiting. Your doctor may prescribe medicine to keep you from feeling sick and throwing up. If the medicine does not help (you can't keep liquids down), call your doctor.
Do not get pregnant while you or your sexual partner are receiving fluorouracil. Use an effective method of birth control while you are getting this medicine.
If you are pregnant, talk to your doctor before you start your treatments.