Acthib and Hiberix

As with any vaccine, there's a rare chance that you might have a severe allergic reaction to Hib vaccine. Your provider might ask you to stay at the pharmacy or clinic for a short period of time after you've received your vaccine to make sure you can get proper care in case of a serious allergic reaction. Sometimes, these reactions can happen after you've already left the clinic. Get medical help right away if you notice symptoms of a severe allergic reaction, such as feeling faint, swelling of the face, closing of the throat, difficulty breathing, hives or rash, dizziness, shaking, nausea, or chest pain.

Hib vaccine might not work as well in people with a weakened immune system. This can put you at higher risk of Hib disease, even after you've received the vaccine. If you have any medical conditions (e.g., human immunodeficiency virus (HIV), cancer) or take medications that weaken your immune system (e.g., high-dose corticosteroids, transplant medications), don't get Hib vaccine until you've talked with your provider first.

Vaccines that are injected into the muscle, like Hib vaccine, can raise the risk of apnea in babies who were born prematurely. This is a condition where babies have a temporary pause in their breathing, with or without a slowed heart rate or low oxygen level. If your baby was born prematurely, be sure to discuss with your child's provider about the benefits and risks of your child receiving Hib vaccine.

Fainting can happen while or after receiving injectable vaccines, such as Hib vaccine. Signs of fainting include changes in vision, burning or tingling sensation, and stiffening or twitching of your arms and legs. Let your provider know if you've fainted after receiving any vaccine in the past so they can monitor you.