Hepabig Hepa B Immune Globulin Human 100 IU 0.5ml Vial is a medication used to provide passive immunity against Hepatitis B infection. Each vial contains 100 IU of human immune globulin in a 0.5ml dosage. It is typically administered to individuals who are exposed to the Hepatitis B virus, either after potential exposure (post-exposure prophylaxis) or for individuals who are at high risk of exposure. The injection helps prevent the onset of Hepatitis B infection by providing immediate immune protection. This vial comes in a pack of 1.