2023-2024 Season Flublok is an antibiotics-free, latex-free, egg-free flu vaccine. Flublok Quadrivalent vaccine arrives in a pack of 10 pre-filled syringes. Each single dose syringe has a volume of 0.5ml.   Age Indication: Flublok is approved for adults 18 years and older.   THIS PRODUCT IS PRESERVATIVE FREE (contains no thimerosal). Returnability: Up to 15% per presentation type are eligible for returns on Sanofi Products. Returns must be in full pack quantities only. Returns are credited to account for future flu vaccine purchases for the following year only.