1 What is Comvax?

Brand: Comvax

Generic: Haemophilus b conjugate

Brand name:


Haemophilus b conjugate vaccine and hepatitis B vaccine is a combination vaccine to prevent infection caused by Haemophilus influenzae type B bacteria and hepatitis B virus.

It works by stimulating the body to produce antibodies against Haemophilus influenzae type B bacteria and hepatitis B virus.

Life-threatening illnesses such as meningitis, epiglottitis, pericarditis, pneumonia, and septic arthritis can be caused by Haemophilus influenza type b (Hib) bacteria infection.

Hepatitis B viral infection is a major cause of serious liver diseases, such as:

Pregnant women who have hepatitis B infection or are carriers of hepatitis B virus can give the disease to their babies when they are born.

These babies often suffer serious long-term illnesses from the disease. Immunization against hepatitis B disease is recommended for all newborn babies, infants, and young children.

This vaccine is to be administered only by or under the direct supervision of your healthcare professional.

Have a question aboutHaemophilus Infections?Ask a doctor now

2 What to Know Before Using

Before taking this drug, the risks and benefits for your body should be discussed with your healthcare provider.

Inform your healthcare provider for any allergic reactions to these drugs or any other drugs, foods, dyes, preservatives, or animals.

Carefully read the label of non-prescription drugs for any possible allergic reaction or contraindications.

Studies have not been performed in infants younger than 6 weeks and older than 15 months of age on the correlation of age to the effects of ComvaxВ® vaccine while safety and efficacy have not been established.

ComvaxВ® vaccine is not recommended for adult or geriatric patients. Adverse effects have been reported in animal studies but studies in pregnant women or animals are still inadequate.

Infant risk is still undetermined when using this medication during breastfeeding. Discuss with your healthcare professional about the risks and benefits of this drug before breastfeeding.

Drugs should not be taken together to prevent any interactions but in necessary cases inquire your healthcare provider regarding the adjustments in dosage or any other necessary precautions to prevent any unwanted side effects.

Inform your healthcare professional if you are taking any other prescription or non-prescription drugs. Intake of specific food or using alcohol or tobacco with this drug is associated with an increased risk of certain side effects.

Your healthcare professional can give you special instructions about the use of food, alcohol, or tobacco.

Inform your healthcare provider for any other medical problems such as allergy to yeast, bleeding problems, and severe illness with a fever, or weak immune system from a disease or drug.

3 Proper Usage

A trained health professional will be the only one to give your child this vaccine. This vaccine is administered intramuscularly given as a shot into one of your child's muscles, usually in the thighs.

This vaccine is usually given as 3 doses at 2, 4, and 12 to 15 months of age unless you are given a different schedule by your healthcare professional.

It is important that your child receives all of the doses of vaccine in this series. Try to keep all of your scheduled appointments.

If your child does miss a dose of this vaccine, make another appointment as soon as possible.

4 Precautions to Take

Return to your healthcare professional at the right time for your child’s second and third dose. Any unwanted effects after receiving the vaccine should be reported to your healthcare professional.

Inform your child's healthcare professional immediately if your child develops a skin rash, hives, or any allergic reaction after receiving this vaccine.

Notify your healthcare professional that your child is taking this vaccine before your child undergoes any medical tests as some results of some tests may be affected by this vaccine.

This vaccine is ineffective if your child is already infected with the virus or bacteria.

5 Potential Side Effects

Side effects may vary for each individual and prompt medical attention should be given if they occur.

Consult with your healthcare professional immediately if you experience symptoms of:

  • fever more than 103 degrees F
  • body aches or pain
  • chills
  • cough
  • the difficulty with breathing
  • ear congestion
  • fever
  • headache
  • loss of voice
  • nasal congestion
  • A runny nose
  • sneezing
  • A sore throat
  • unusual tiredness or weakness
  • black, tarry stools
  • bleeding gums
  • blistering
  • peeling or loosening of the skin
  • blood in the urine or stools
  • convulsions
  • diarrhea
  • the difficulty with swallowing
  • dizziness
  • fast heartbeat
  • hives
  • itching
  • joint or muscle pain
  • large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
  • pinpoint red spots on the skin
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • red, irritated eyes
  • shortness of breath
  • skin rash
  • sores
  • ulcers, or white spots in the mouth or on the lips
  • tightness in the chest
  • unusual bleeding or bruising
  • wheezing

Some side effects may occur that usually do not need medical attention. As your body adjusts to the medicine, the side effects will slowly disappear. 

Ask your healthcare professional about ways to prevent or reduce some of these side effects. If any of the following side effects. 

If any of the following side effects persists or are inconvenient, or if you notice any other effects, or if you have any questions about them, consult with your health care professional. 

Report any side effects to the FDA hotline at 1-800-FDA-1088.