Because it contains an ingredient from human blood, tell us if you have ever reacted to this injection or to immunoglobulin. It is not given during a severe asthma attack, just before or during a menstrual period, if you are or may be pregnant, or if you are severely weakened.
Swelling or itching at the injection site can occur, and a severe allergic reaction such as shock is possible in rare cases, so we observe you briefly after each shot. Because it is made from human blood, the risk of infection or blood clots cannot be ruled out completely. Seek emergency care right away if you become short of breath, have chest pain, or notice pain and swelling in one arm or leg.