How Does Havrix Work?This vaccine contains inactivated (killed) hepatitis viruses. Because Havrix is not "live," there is no chance that a person could get hepatitis A from it.
Simply stated, this vaccine allows the body to be exposed to the hepatitis A virus without risking the actual disease. The body produces antibodies that will help fight infection if future exposure occurs.
Off-Label Uses for HavrixOn occasion, your healthcare provider may recommend this vaccine for something other than the purpose discussed in this article (this would be known as an "off-label" use). Using the pediatric Havrix formulation for adults (or using the adult formulation for children or teens) would be an off-label Havrix use. This type of use is likely to occur during times of vaccine shortages.
Also, using Havrix to help prevent hepatitis A after an individual has already been exposed to the virus (a practice known as post-exposure prophylaxis) is an off-label use.