Side effects include redness, tenderness, or swelling at the injection site. Fever is also a risk. There have also been reports of drowsiness and loss of appetite. Generally, all vaccines can have a very small risk of serious problems.
(eg, Tylenol) is sometimes given to reduce pain and fever that may occur after getting a vaccine. In infants, the medicine may weaken the vaccine's effectiveness. Discuss the risks and benefits of taking acetaminophen with the doctor.
Half of the people who get the vaccine have mild side effects. These may include redness or pain at the injection site. Less than 1% will develop a fever, muscle aches, or more severe local reactions. In rare cases, severe allergic reactions and other serious problems occur. However, developing the disease is much more likely to cause serious problems than getting the vaccine.