Vaccine	Patient’s age	Dose	Volume (mL)	Number of doses	Schedule (months)*
Hepatitis A vaccine, inactivated (Havrix)	12 months to 18 years	720 EL.U.	0.5	2	0, 6 to 12
	19 years or older	1,440 EL.U.	1.0	2	0, 6 to 12
Hepatitis A vaccine, inactivated (Vaqta)	12 months to 18 years	25 U	0.5	2	0, 6 to 18
	19 years or older	50 U	1.0	2	0, 6 to 18
Combined hepatitis A and hepatitis B vaccine (Twinrix)	18 years or older	720 EL.U. of hepatitis A antigen and 20 mcg of hepatitis B surface antigen protein	1.0	3	0, 1, and 6