Immunorel 5gm Solution for Infusion consists of proteins of liquid human serum, containing the antibodies of healthy adults. This is used to strengthen the body's natural defense system (immune system) to lower the risk of infection in persons with a weakened immune system. This is given by injection under the skin or slowly into a vein as directed by your doctor. This is made from healthy human blood that has a high level of certain defensive substances (antibodies), which help fight infections. It is also used to increase the blood count (platelets) in persons with a certain blood disorder (idiopathic thrombocytopenic purpura-ITP). Your healthcare professional will start the medication slowly while monitoring you closely. You may experience side effects such as headache, nausea, chills, fatigue, fever, upper abdominal pain, diarrhea, back pain, injection site reactions, excessive sweating, and flushing. Tell your doctor if you are bothered by any of these side effects.