Hertraz 440mg Injection is used for the treatment or prevention of the following disease(s):Metastatic (Spread) Breast Cancer....Hertraz 440mg Injection contains – TrastuzumabTrastuzumab works by attaching itself to the HER2 proteins (also known as receptors) so that the cancer cells are no longer stimulated to grow. It also helps the body’s immune system destroy breast cancer cells....The dosage of Hertraz 440mg Injection depends on many factors such as the patient age, health, medical condition or history of the patient and many other conditions.