HERTRAZ 0 MG (TRASTUZUMAB) is a prescription drug Treats certain types of breast and stomach cancer. It is used with other chemotherapy drugs and works in the following ways: It prevents the action of a certain protein in the body. HERTRAZ 0 MG (TRASTUZUMAB) can help slow the growth of cancer cells and prevent them from spreading to other parts of the body. Buy HERTRAZ 0 MG (TRASTUZUMAB) now from our online store and get it delivered straight to your door.