Engerix-B Side Effects

Side Effects to Report

There are a number of rare but serious Engerix-B side effects that you should report immediately to your healthcare provider. These include but are not limited to:
  • A high fever
  • Any unusual behavior changes in a child (aside from the usual fussiness that typically occurs after vaccinations)
  • A seizure
  • Persistent, inconsolable crying (in a child), lasting for three hours or more
  • Worsening of multiple sclerosis (MS)
  • Slow or irregular breathing (in an infant)
  • Signs of an allergic reaction, such as:
    • An unexplained rash
    • Hives
    • Itching
    • Swelling of the mouth or throat
    • Wheezing
    • Difficulty breathing.

Rare Engerix-B Side Effects

The side effects reported below occurred either in clinical studies (in less than 1 percent of people receiving the vaccine) or were reported in postmarketing experience, which refers to reports of side effects from healthcare providers after the vaccine was approved.
With any of these reactions, it is difficult (if not impossible) to know if they are actually linked to the vaccine. Many of these "side effects" are likely coincidental occurrences.
These rare side effects of Engerix-B include but are not limited to:
  • Upper respiratory tract infections, such as the common cold
  • Loss of appetite
  • Agitation
  • Insomnia
  • Drowsiness
  • Flushing
  • Low blood pressure (hypotension)
  • Constipation or diarrhea
  • Nausea and vomiting
  • Shingles
  • Low blood platelets
  • Delayed allergic reactions (occurring days or weeks afterwards)
  • Arthritis
  • Inflammation and swelling of the brain (encephalitis)
  • Bell's palsy
  • Prolonged pauses in breathing (apnea) in very premature infants
  • Paralysis
  • A spinning sensation (vertigo)
  • Ringing in the ears (tinnitus)
  • Hair loss.
A Dose of Reassurance for Parents of Picky Eaters

Engerix-B Vaccine Information

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