The most common side effects associated with Herceptin in patients with metastatic stomach cancer are:
- Low white blood cell counts
- Low red blood cell counts
- Swelling of the mouth lining
- Weight loss
- Upper respiratory tract infections
- Low platelet counts
- Swelling of the mucous membranes
- Swelling of the nose and throat
- Change in taste
The most common side effects associated with Herceptin in patients with
breast cancer are:
- Infusion reactions
- Increased cough
- Shortness of breath
- Low white and red blood cell counts
- Muscle pain
Herceptin may cause serious side effects (see "Drug Precautions").
- Herceptin treatment can result in heart problems, including those without symptoms (such as reduced heart function) and those with symptoms (such as congestive heart failure).
- Some patients have had serious infusion reactions and lung problems; infusion reactions leading to death have been reported.
- Herceptin can cause harm to the fetus (unborn baby), in some cases death to the fetus, when taken by a pregnant woman.
- Taking Herceptin Can Result in Serious and Potentially Deadly Lung Problems, Including:
- A severe shortness of breath
- Fluid in or around the lungs
- Weakening of the valve between the heart and the lungs
- Too little oxygen in the body
- Swelling of the lungs
- Scarring of the lungs