Comvax is part of the Vaccinations class and treats Hepatitis B. Vaccinations are used to prevent a number of infections, conditions, and diseases, including chickenpox, hepatitis A, hepatitis B, HPV, meningitis, pneumonia, ear infections, rabies, typhoid, rotavirus, flu, and shingles. They work to build immunity and protection in the body. Comvax is only available as a brand name drug.