Vivitra 150 mg Injection Vivitra 150 mg is a trastuzumab-based biological medicine supplied as a lyophilized powder for preparation of an intravenous infusion. It is designed to target the HER2 (human epidermal growth factor receptor 2) protein, which can be present in increased amounts on certain cancer cells. By binding to HER2, trastuzumab can interfere with HER2-related growth signals and help the immune system recognize and act against HER2-expressing cancer cells.