INFLUENZAVACCINE reduces the risk of the influenza (
flu). It does not treat influenza. It is still possible to get influenza after receiving this vaccine, but the symptoms may be less severe or not last as long. It works by helping your immune system learn how to fight off a future infection. Get Flublok for as low as $42.00, which is 63% off the average retail price of $112.82 for the most common version, by using a GoodRx coupon.