Gammaren Solution for Infusion is used to strengthen the body's natural immune system to lower the risk of infection in persons with weakened immune system. It is made from healthy human blood that has a high level of certain defensive substances (antibodies), which help fight infections. Gammaren Solution for Infusion has been shown to be effective in preventing infections in bone marrow transplant patients more than 20 years of age in the first 100 days post-transplant. It is used in the treatment of patients where antibody-forming capacity is severely impaired thereby subjecting them to a greater risk of infections. Gammaren Solution for Infusion gives you antibodies that your body is not making on its own so you can fight infections. Both children and adults can have this therapy. It is administered as an injection. Your doctor will monitor you for some time after the administration of Gammaren Solution for Infusion to check for any side effects. Gammaren Solution for Infusion may sometimes cause side effects like back pain, chills, flushing (sense of warmth in the face, ears, neck, and trunk), dizziness, headache, nausea, decreased blood pressure, and muscle pain. If you get any of these, or other side effects, or just feel unwell, you should tell your doctor. There may be ways of preventing or reducing these effects. Before using it, you should tell your doctor if you have 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.