Because Herceptin targets particular cells, it is less damaging to healthy cells than other types of treatment. Compared with chemotherapy, the side effects are mild. This list of side effects is listed alphabetically. Ask your doctor which ones are most likely for you.
If you have trouble breathing, call your doctor immediately. You may find that the side effects are less severe after your first treatment. They usually go away or get better within a few weeks after your treatment ends. If you’re having uncomfortable side effects, tell your doctor or nurse so that they can help you ease them.