Three shots!

Patient receiving a Hep B vaccination
The Hepatitis B immunization requires three injections spread over several months.

The hepatitis B immunization series requires three separate injections.

The hepatitis B vaccine is very effective in protecting against the hepatitis B virus. Approximately 90 percent of people who receive the vaccine will become fully immune to the virus. It is given in a series of three shots. The entire series of shots is required to provide full immunity. The vaccine is safe with very few adverse reactions.

Typical Vaccination Schedule: The first injection can be administered at any given time. The second injection must be given at least one month after the first, and the third injection must be given six months after the first.