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.