BICELTIS Trastuzumab is one of a group of cancer drugs called monoclonal antibodies. Monoclonal antibodies are sometimes called targeted therapies because they work by ‘targeting’ specific proteins (receptors) on the surface of cells. Some cancers have too much of a protein called human epidermal growth factor receptor 2 (HER2) on the surface of their cells. These are called HER2-positive cancers. The extra HER2 receptors stimulate the cancer cells to divide and grow. Trastuzumab locks on to the HER2 protein and blocks the receptor. This stops the cells from dividing and growing.
Some side effects may occur during the injection. Speak your doctor right away if you feel dizzy, nauseated, light-headed, weak, short of breath, or if you have a headache, fever, chills, sudden chest pain, wheezing, dry cough, hives, or swelling of your face, lips, tongue, or throat.
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects.