The Hepatitis B Vaccine: Health 101

Are there any side effects from the hepatitis B vaccine?

Contracting hepatitis B is far more dangerous than any side effects from the vaccine. Though allergic reactions are possible, the hepatitis B vaccine generally only causes mild side effects.

  • Up to 25 percent of people will experience redness, swelling, or warmth near the shot site.
  • Up to 7 percent of people will experience a mild fever (over 99.9 F.).

As with any vaccine, severe allergic reactions are rare, but possible. If you notice your child having difficulty breathing, hoarseness or wheezing, hives, paleness, weakness, dizziness, or a rapid heartbeat shortly after receiving a shot, call your doctor right away.

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