It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.
Your doctor may test your heart before you start receiving trastuzumab injection and while you are getting treatments with this medicine. Contact your doctor right away if you experience any chest pain, increased coughing, trouble with breathing, a sudden difficulty with breathing at night, rapid weight gain, or abnormal swelling in your ankles or legs. These could be symptoms of a serious heart problem.
This medicine may cause infusion-related reactions, which can be life-threatening and require immediate medical attention. Tell your doctor right away if you start to have a fever, chills or shaking, dizziness, trouble breathing, itching or rash, lightheadedness or fainting after receiving this medicine.
Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant during therapy and for 7 months after the last dose of this medicine. If you think you have become pregnant while using the medicine, tell your doctor right away.
Serious lung or breathing problems may occur after you receive this medicine. Call your doctor right away if have changes in your breathing, chest tightness, or any type of breathing problem.
This medicine can temporarily lower the number of white blood cells in your blood, which increases the chance of getting an infection. If this occurs, there are certain precautions you can take to reduce the risk of infection:
If you can, avoid people with infections. Check with your doctor right away if you think you are getting an infection or if you get a fever or chills, a cough or hoarseness, lower back or side pain, or have painful or difficult urination.
Check with your doctor immediately if you notice any unusual bleeding or bruising, black, tarry stools, blood in the urine or stools, or pinpoint red spots on your skin.
Do not touch your eyes or the inside of your nose unless you have just washed your hands and have not touched anything else in the meantime.