Although rare in the U.S., diphtheria is a serious disease that can cause life-threatening illnesses.
Diphtheria is transmitted through contact with an infected person or a carrier of the disease.
Diphtheria antitoxin is to be administered only by or under the supervision of your doctor or other health care professional. In deciding to use a medicine, the risks of using the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. Also tell your health care professional if you are allergic to any other substances, such as preservatives. It is not known whether diphtheria antitoxin passes into the breast milk.