Trastuzumab is a medication used to treat certain types of cancer, notably HER2-positive breast cancer and HER2-positive metastatic gastric or gastroesophageal junction adenocarcinoma. It is a monoclonal antibody that targets the HER2 protein, which is overexpressed in some cancer cells.
The dosage of trastuzumab can vary depending on factors such as the specific type and stage of cancer being treated, as well as the patient's weight and overall health. Trastuzumab is typically administered as an intravenous (IV) infusion.
For HER2-positive breast cancer, the dosage might be 440 mg given initially as a loading dose, followed by subsequent doses at a lower maintenance dosage. The treatment schedule can vary depending on whether trastuzumab is used in combination with other chemotherapy drugs or as a standalone therapy.
As with any medication, it's important to follow the dosage and administration instructions provided by your healthcare provider. They will tailor the treatment plan to your specific needs and monitor you for any potential side effects.