Drug information provided by: Micromedex

It is very important that your doctor check your progress at regular visits. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to receive it. Blood tests may be needed to check for unwanted effects.

Your doctor may test your heart before you start receiving trastuzumab 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 serious heart problems.

Using this medicine while you are pregnant may cause very serious birth defects. Use an effective form of birth control to keep from getting pregnant during therapy and for 7 months after the last dose. If you think you have become pregnant while using the medicine, tell your doctor right away.

Trastuzumab may cause a serious infusion reaction. This can be life-threatening and requires immediate medical attention. Tell your doctor or nurse right away if you have a fever, chills, chest pain, lightheadedness, dizziness, fainting, headache, rash, pain, nausea, vomiting, trouble with breathing, or weakness while you receive the medicine or after the infusion.

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.

This medicine may cause lung disease or breathing problems. Tell your doctor right away if you are having shortness of breath, chest tightness, or any type of breathing problem while receiving this medicine.