Triaxis (Tdap) is a vaccine used as a booster to protect against diphtheria, tetanus, and whooping cough in children aged 4 and older, adolescents, and adults.
All age groups for whom Triaxis is intended receive one injection (0.5 milliliter).
The vaccine is given by a doctor or nurse into the side of the upper arm (deltoid muscle).
One single dose (0.5 ml) is given; the timing for additional doses will be determined by a doctor based on previous vaccinations.