(diphtheria, tetanus acellular, and pertussis adult vaccine - also called Tdap) is used to help prevent tetanus, diphtheria, and pertussis in people who are at least 10 years old. Most people in this age group require only one Tdap shot for protection against these diseases. Adacel vaccine is approved for use as a single dose in individuals 10 through 64 years of age. Five years should have elapsed since the recipient’s last dose of tetanus toxoid, diphtheria toxoid and/or pertussis-containing vaccine and the administration of Adacel vaccine.
FDA UPDATE 1/15/2019:
The U.S. Food and Drug Administration has approved the expanded use of Adacel® (Tetanus Toxoid, Reduced Diphtheria Toxoid and Acellular Pertussis (Tdap) Vaccine Adsorbed) to include repeat vaccination to help protect against tetanus, diphtheria and pertussis. It is now the first and only Tdap vaccine in the U.S. approved for a repeat dose in people 10 through 64 years of age 8 years or more after the first vaccination. Adacel is also the only Tdap vaccine available in a syringe made without natural rubber latex, which may help reduce risk to patients with an allergy.