| | Conditions & Treatments | Cold & Flu How will you know if the flu vaccine is expired? The expiration date of a flu vaccine is indicated on the vaccine vial or packaging. The vaccine should not be used after the expiration date. Cold & Flu - Related Articles What Can Be Done to Ease Very Dry Nose Membranes? Dry Cough Home Remedies Haemophilus Influenzae Infection How to Get Rid of a Cold Fast About Dextromethorphan How to Choose Over-the-Counter Cold and Flu Meds Cold Flu Relief