Pastobov Dosage and administration Administer by the intramuscular or the subcutaneous route. Inject one 2 ml dose according to the following schedule: Primary vaccination Preferably before the risk period: 1st injection at a minimum age of 4 weeks, and 2nd injection 21-28 days later. Booster vaccination Preferably before each risk period: one injection no later than one year after the first vaccination.