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Liquid PedvaxHIB Side Effects

Generic name: haemophilus b conjugate (prp-omp) vaccine

Note: This document contains side effect information about haemophilus b conjugate (prp-omp) vaccine. Some dosage forms listed on this page may not apply to the brand name Liquid PedvaxHIB.

Applies to haemophilus b conjugate (prp-omp) vaccine: intramuscular suspension.


Tell your doctor if your child uses other medicines or have other medical conditions or allergies.

Get emergency medical help if your child has signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Keep track of any and all side effects your child has after receiving this vaccine. When the child receives a booster dose, you will need to tell the doctor if the previous shot caused any side effects.

Call your doctor at once if your child has:

  • high fever (within a few hours or a few days after the vaccine);

  • a seizure; or

  • fussiness, irritability, crying for an hour or longer.

Common side effects may include:

  • irritability, crying;

  • drowsiness;

  • diarrhea, vomiting;

  • rash;

  • pain, swelling, or redness where the shot was given;

  • cold symptoms such as stuffy nose, sneezing, sore throat; or

  • ear infection--fever, ear pain or full feeling, trouble hearing, drainage from the ear, fussiness in a child.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to haemophilus b conjugate (prp-omp) vaccine: intramuscular suspension.


The most common adverse events were irritability, sleepiness, injections site pain/soreness, injection site swelling, unusual high-pitched crying, prolonged crying (over 4 hours), diarrhea, vomiting, crying, pain, otitis media, rash, and upper respiratory infection.[Ref]


Very common (10% or more): Fever over 38.3C (rectal) (18.1%)

Common (1% to 10%): Unusual high-pitched crying, prolonged crying (over 4 hours), crying, pain[Ref]


Common (1% to 10%): Diarrhea, vomiting

Frequency not reported: Urticaria[Ref]


Common (1% to 10%): Erythema over 2.5 cm diameter, swelling over 2.5 cm diameter, injection site pain/soreness

Postmarketing reports: Sterile injection site abscess[Ref]


Common (1% to 10%): Irritability, sleepiness[Ref]


Common (1% to 10%): Otitis media, upper respiratory infection[Ref]


Common (1% to 10%): Rash

Postmarketing reports: Angioedema[Ref]

Nervous system

Postmarketing reports: Febrile seizures[Ref]


Frequency not reported: Thrombocytopenia[Ref]


Frequency not reported: Tracheitis[Ref]

More about Liquid PedvaxHIB (haemophilus b conjugate (prp-omp) vaccine)

Patient resources

Professional resources

Related treatment guides


1. "Product Information. Liquid PedvaxHIB (haemophilus b conjugate (PRP-OMP) vaccine)." Merck & Company Inc (2022):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.