Off-Label use of vaccines may save lives and money: lessons from the province of Quebec, Canada

With one exception, OL vaccine use in Quebec was successful. Reducing the number of doses or recommending the use of two different vaccines in a single immunization regimen (one vaccine having a much lower purchase cost than the other) allowed for more cost-effective immunization programs. Another OL's justification was to increase protection, by extending the age limit or interval between doses, or allowing an interchangeability of available vaccines. OL vaccine use should always be considered when properly justified by scientific evidence and vaccinology principles, and carefully evaluated when implemented.