CDC recommends that if a provider mistakenly administers varicella vaccine to a person for whom zoster vaccine is indicated, no specific safety concerns exist, but the dose should not be considered valid. You should administer a dose of Shingrix to the patient during that same visit (same day). If the error is not detected and corrected on the same day, Shingrix should be administered at least 8 weeks after receipt of the varicella vaccine. However, if Shingrix is inadvertently administered less than 8 weeks after the varicella vaccine, CDC experts state that the Shingrix dose does not need to be repeated if given at least 24 days after the varicella vaccine (in other words, 4 weeks minus the 4-day grace period). A second dose of Shingrix should be given 2–6 months after the first dose of Shingrix.
These events should be documented and procedures put in place, such as checking the vial label 3 times to be sure you are administering the product you intend, to prevent this from happening again.