The vaccine may be less effective in protecting against flu, if administered after the amended expiry date
AstraZeneca UK has revised the expiry dates for certain batches of Fluenz Tetra nasal spray vaccines as a precautionary measure, after finding that their potency (strength) dropped faster than predicted once thawed, during routine testing.
The Medicines and Healthcare products Regulatory Agency (MHRA) has been informed by the manufacturer that the printed expiry date for a limited number of batches is “incorrect.”
However, the MHRA has assured patients that the affected batches are safe to use and fully effective within the amended expiry date.
If the vaccine is administered after the amended expiry date, it may be less effective in protecting against flu, it said.
The UK regulatory authority also reiterated that it “keeps the safety of medicines, including vaccines, under review, and acts where necessary to protect patients and the public.”
Sufficient action is being taken to ensure that affected batches of the nasal sprays are used ahead of their expiry date, and healthcare professionals and wholesalers have been alerted of this issue.
“Any unused products after the expiry dates will be quarantined for return,” the agency added.
Patients or their carers are advised to contact a healthcare professional if they are concerned about their nasal spray vaccine or have any further questions.
Any suspected adverse reactions should be reported to the Yellow Card scheme.