Drug Interaction Report

Nefazodone may increase the blood levels of ado-trastuzumab emtansine. This can increase the risk and/or severity of side effects such as liver impairment, heart failure, nerve damage, and bleeding problems. You may not be able to take ado-trastuzumab emtansine during treatment with nefazodone, or you may need a dose adjustment and/or more frequent monitoring by your doctor to safely use both medications. Your doctor may also be able to prescribe alternatives that do not interact. You should contact your doctor if you experience shortness of breath, coughing, swelling of the legs or ankles, sudden weight gain, palpitations, dizziness or loss of consciousness, as these may be early symptoms of heart failure. You should also seek immediate medical attention if you develop signs and symptoms of liver damage such as fever, chills, joint pain or swelling, unusual bleeding or bruising, skin rash, itching, loss of appetite, fatigue, nausea, vomiting, dark colored urine, light colored stools, and yellowing of the skin or eyes. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Alcohol can increase the nervous system side effects of nefazodone such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with nefazodone. Do not use more than the recommended dose of nefazodone, and avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you. Talk to your doctor or pharmacist if you have any questions or concerns.