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What Are the Risks Associated With the Hepatitis B Vaccine?
All vaccines are capable of causing serious problems, such as a severe allergic reaction.
Most people who get the hepatitis B vaccine do not have problems. Some may have mild problems, including soreness where the shot was given and fever.
Acetaminophen (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.
Who Should Not Get Vaccinated?
You should not get the vaccine if you:
- Had a life-threatening allergic reaction to baker's yeast or to a previous dose of hepatitis B vaccine
- Are moderately or severely ill—Wait until you recover to get the vaccine.