Currently, immunisation against hepatitis B requires injectable vaccines, with the first booster shot after one month, and the second after six months.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hepatitis-b-oral-vaccine-project-moves-little-closer-completion
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/medical-research
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hepatitis
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/immunisation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india