Lapatinib Side Effects
What should I watch for?
Visit your doctor for checks on your progress. You will need to have regular blood tests while on this medicine.
Report any new symptoms promptly. Let your doctor know if you have any change in bowel patterns, nausea, loss of appetite, or vomiting, as these side effects may cause dehydration. If you have shortness of breath, contact your doctor. Possible serious side effects include heart or lung problems.
Do not become pregnant while taking this medicine. Women should inform their doctor if they wish to become pregnant or think they might be pregnant. There is a potential for serious side effects to an unborn child. Talk to your health care professional or pharmacist for more information. Do not breast-feed an infant while taking this medicine.
Common and Rare Side Effects
Along with its needed effects, a medicine 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 immediately if any of the following side effects occur:
Difficult or labored breathing
fast or irregular heartbeat
tightness in the chest
unusual tiredness or weakness
Abdominal or stomach pain or tenderness
clay colored stools
itching or skin rash
loss of appetite
swelling of the feet or lower legs
yellow eyes or skin
Incidence not known
Blistering, peeling, loosening of the skin
difficulty with swallowing
general feeling of discomfort or illness
joint or muscle pain
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
red skin lesions, often with a purple center
red, irritated eyes
sores, ulcers, or white spots in the mouth or on the lips
thickening of bronchial secretions
Some side effects 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:
Acid or sour stomach
pain in the arms or legs
redness, swelling, or painful skin
scaling of the skin on the hands and feet
sores, ulcers, or white spots on the lips, tongue, or the inside of the mouth
stomach discomfort, upset, or pain
swelling or inflammation of the mouth
tingling of the hands and feet
Incidence not known
Loosening of the fingernails
redness or soreness around the fingernails
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.