Hepabsv 100IU Injection helps to protect you against hepatitis B (a virus that damages the liver). It is used to prevent hepatitis B after exposure to contaminated blood through sexual contact, accidental needle prick injury, from an infected mother to her newborn or after a liver transplant. Hepabsv 100IU Injection is normally given along with the hepatitis B vaccine. It comes from human blood plasma and is given by an injection into a large muscle such as your thigh or buttock. Your doctor will inject the prescribed dose after analyzing your condition. It should be given as soon as possible after the risk of infection is identified. If it is delayed too long, it may not be effective. This medicine is not a vaccine and will not provide long-term protection from hepatitis B.This medicine may sometimes cause side effects like flushing, gastrointestinal disturbance (stomach pain and upset, nausea, vomiting), headache, dizziness, and injection site reactions (pain, swelling, and redness). If you get any of these, or other reactions, or just feel unwell, you should tell your doctor. There may be ways of preventing or reducing these effects. Any serious reaction to the injection is rare. Before using it, you should tell your doctor if you have kidney disease, any problems with blood clotting and if you have recently had, or plan to have a vaccination. It is not known whether this medicine is completely safe during pregnancy or breastfeeding so please take advice from your doctor.