It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly and to check for unwanted effects.
Your doctor may request that you have a test to determine if your blood is clotting properly, and may preform this test frequently if you are also taking an anticoagulant (blood thinner).
Stop taking this medicine and check with your doctor immediately if any of the following occur:
- Diarrhea, moderately severe (four to six stools a day more than usual, or during the night).
- Pain, blistering, peeling, redness, or swelling of the palms of your hands or the bottoms of your feet that is severe enough to interfere with your normal activities.
- Nausea that is severe enough to cause you to eat less than usual.
- Vomiting that occurs two times, or more, in a 24-hour period.
- Pain and redness, swelling, or sores or ulcers in your mouth or on your lips that are severe enough to interfere with eating.
If vomiting occurs less often than mentioned above, or if nausea does not cause you to eat less than usual, it is not necessary for you to stop taking the medicine or to check with your doctor (unless these effects are particularly bothersome). Also, you do not need to stop taking the medicine if diarrhea occurs less often than mentioned above or if the other side effects listed are not severe enough to interfere with eating or other daily activities. However, check with your doctor as soon as possible if they occur.
While you are being treated with capecitabine, and after you stop treatment with it, do not have any immunizations (vaccines) without your doctor's approval. Capecitabine may lower your body's resistance and the vaccine may not work as well or you might get the infection the vaccine is meant to prevent. In addition, you should not be around other persons living in your household who receive live virus vaccines because there is a chance they could pass the virus on to you. Some examples of live vaccines include measles, mumps, influenza (nasal flu vaccine), poliovirus (oral form), rotavirus, and rubella. Do not get close to them and do not stay in the same room with them for very long. If you have questions about this, talk to your doctor.
Capecitabine can temporarily lower the number of white blood cells in your blood, increasing the chance of getting an infection. It can also lower the number of platelets, which are necessary for proper blood clotting. If this occurs, there are certain precautions you can take, especially when your blood count is low, to reduce the risk of infection or bleeding:
- If you can, avoid people with infections. Check with your doctor immediately if you think you are getting an infection or if you get a fever or chills, cough or hoarseness, lower back or side pain, or painful or difficult urination.
- Check with your doctor immediately if you notice any unusual bleeding or bruising, black, tarry stools, blood in the urine or stools, or pinpoint red spots on your skin.
- Be careful when using a regular toothbrush, dental floss, or toothpick. Your medical doctor, dentist, or nurse may recommend other ways to clean your teeth and gums. Check with your medical doctor before having any dental work done.
- Do not touch your eyes or the inside of your nose unless you have just washed your hands and have not touched anything else in the meantime.
- Be careful not to cut yourself when you are using sharp objects such as a safety razor or fingernail or toenail cutters.
- Avoid contact sports or other situations where bruising or injury could occur.