The standard dosage of Adacel is one 0.5 mL vaccine given as a single, one-time injection. This is typically given between the ages of 11 and 12, although the vaccine can be given at any time (as long as five years have passed since your previous Td booster).
There is only one standard dosage for Adacel® (Tdap vaccine), although it can be confusing to know when exactly (or if) the vaccine should be given. The following factors will influence the timing of the vaccine:
- Your previous vaccination history
- Your age
- Whether or not you have been exposed to pertussis.
The standard Adacel dosage is one vaccine (0.5 mL) injected one single time in individuals 11 to 64 years of age. Ideally, this will be given between the ages of 11 and 12, although Adacel can be given at any time as long as at least five years has passed since the previous Td (tetanus and diphtheria) booster was given.
In some cases, at the healthcare provider's discretion, Adacel can be given sooner than five years. For instance, if you have been exposed to pertussis, your healthcare provider may decide to give Adacel even if it has not been five years since your last Td.
It is recommended that women receive Adacel immediately after giving birth (if they have not already gotten the Tdap vaccine earlier), in order to prevent the spread of pertussis to the newborn, as long as at least two years have passed since the previous Td booster.
After being vaccinated with Adacel, it is recommended that people continue to receive the Td vaccine every 10 years (as was previously recommended). Essentially, Adacel replaces one of the Td boosters (for most people).
Although most people should receive only one dose of Tdap (either Boostrix or Adacel), there is one exception. Pregnant women should receive a dose with each pregnancy, even if they have received the vaccine previously. This will help protect the newborn from pertussis. Ideally, it should be given any time from 27 to 36 weeks of pregnancy, although it can be given any time.
If a woman chooses not to get the vaccine during pregnancy, it is recommended that she receive the vaccine immediately after giving birth.