Herceptin (trastuzumab) is a cancer medication that interferes with the growth and spread of cancer cells in the body.
It is used to treat certain types of breast cancer or stomach cancer. Other cancer medicines are sometimes used in combination with Herceptin.
Do not use Herceptin if you are pregnant. It could harm the unborn baby. Avoid becoming pregnant for at least 7 months after your last dose of trastuzumab.
This medication can cause heart failure, especially if you have heart disease or if you are also receiving certain other cancer medicines.
Some side effects may occur during the injection. Tell your caregiver 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.
You should not use this drug if you are allergic to trastuzumab.