HEXAVAC is indicated to help protect your child against diphtheria, tetanus, pertussis, poliomyelitis, infection of the liver caused by all known subtypes of hepatitis B virus and invasive disease (infection of brain and spinal cord tissues, infection of the blood, etc.) caused by Haemophilus influenzae type b (Hib) bacterium in children 8 weeks to 18 months of age.