The price of trastuzumab is usually around $5,000 to $8,000, and varies due to different regions and hospitals. And now trastuzumab is reimbursed in many areas, and after reimbursement, individuals may only need to bear a small amount of cost. Trastuzumab is a monoclonal antibody that acts on human epidermal growth factor receptor II (HER2) and is mainly used to treat certain HER-2 positive breast cancers. The price of trastuzumab fluctuates due to different regions and hospitals, so the price of trastuzumab cannot be generalized. Adverse effects of trastuzumab include abdominal pain, fatigue, chest pain, chills, fever, headache, constipation, diarrhea, and joint pain. This drug is contraindicated in patients who are allergic to trastuzumab. How much does trastuzumab cost can not be generalized, during the use of trastuzumab, you need to observe their own situation, to avoid the occurrence of heavier adverse reactions. During this period, you should pay attention to your diet and limit spicy and stimulating foods to reduce the adverse effects of the drug.