Comvax

Comvax is a vaccine used to help prevent Haemophilus influenzae type b and against infection caused by all known subtypes of hepatitis B virus in infants 6 weeks to 15 months of age born of hepatitis B negative mothers.

Comvax is a vaccine that is given as a shot into the thigh.

Common side effects of Comvax include soreness, redness, and swelling at the injection site. 

Comvax is a vaccine used to help prevent Haemophilus influenzae type b and against infection caused by all known subtypes of hepatitis B virus in infants 6 weeks to 15 months of age born of hepatitis B negative mothers.

Comvax is a vaccine that is given as a shot into the thigh.

Infants born to hepatits B negative mothers should be vaccinated with three doses of Comvax, ideally at 2, 4, and 12-15 months of age. If the recommended schedule cannot be followed, the interval between the first two doses should be at least six weeks and the interval between the second and third dose should be as close as possible to eight to eleven months.

Haemophilus b disease may occur in the week after vaccination, prior to the onset of the protective effects of the vaccines. 

Use caution when vaccinating latex-sensitive individuals since the vial stopper contains dry natural latex rubber that may cause allergic reactions.

Your child should not take Comvax if they are allergic to Comvax or any of its components. 

Common side effects of Comvax include:

• soreness, redness, and swelling at the injection site
• drowsiness (somnolence)
• irritability
• crying (unusually high and/or prolonged (>4 hours)
• an eating disorder associated with low body weight (anorexia)
• vomiting
• ear infection (otitis media)
• fever
• diarrhea
• upper respriatory infection
• rash
• runny nose (rhinorrhea)
• chest congestion
• cough
• fungal infection in the mouth (oral candidiasis)
• diaper rash

​This is not a complete list of Comvax side effects. Ask your doctor or pharmacist for more information.

Tell your doctor if you have any side effect that bothers you or that does not go away.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

Tell your doctor about all the medicines you take including prescription and nonprescription medicines, vitamins and herbal supplements. Especially tell your doctor if you take:

• medicines that weaken the immune system

This is not a complete list of Comvax drug interactions. Ask your doctor or pharmacist for more information. 

Tell your doctor if you are pregnant or plan to become pregnant.

The FDA categorizes medications and vaccines based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.

Comvax falls into category C. No studies have been done in animals, and no well-controlled studies have been done in pregnant women. Comvax should be given to a pregnant women only if clearly needed. 

Tell your doctor is you are breastfeeding or plan to breastfeed. 

It is not known if Comvax crosses into human milk. Because some vaccines can cross into human milk and becuase of the possibility for serious adverse reactions in nursing infants with use of this vaccine, a choice should be made whether to stop nursing or stop the use of this vaccine. Your doctor and you will decide if the benefits outweigh the risk of using Comvax.