Vaccine Info

Flublok Quadrivalent Influenza Vaccine


Flublok Quadrivalent is a quadrivalent recombinant influenza vaccine. Flublok Quadrivalent consists of the four influenza strains that have been identified to be the most likely strains for the flu season. A recombinant flu vaccine is produced using a method which does not require an egg-grown vaccine virus and does not use chicken eggs in the production process. 


Flublok Quadrivalent is indicated for active immunization for the prevention of influenza disease caused by influenza A subtype viruses and type B virus(es) contained in each vaccine. Flublok Quadrivalent vaccine is approved for use in persons 18 years of age and older.


Flublok Quadrivalent is administered as an intramuscular (IM) injection.

Adverse Events

Flublok Quadrivalent vaccine should not be given to anyone who has had a severe allergic reaction (eg, anaphylaxis) to any component of the vaccine (including egg or egg products for Fluzone Quadrivalent and Fluzone High-Dose vaccines) or after a previous dose of the corresponding vaccine. 

Tell your health care professional if you/your child have ever experienced Guillain-Barré syndrome (severe muscle weakness) after a previous dose of influenza vaccine. If you notice any other problems or symptoms following vaccination, please contact your health care professional immediately.

Side Effects

In adults, the most common side effects to Flublok Quadrivalent vaccine include pain where the shot was given; headache and muscle aches. 

In children, the most common side effects to Flublok Quadrivalent vaccine include pain, redness, and swelling where the shot was given; muscle aches, fatigue, and headache (irritability, abnormal crying, drowsiness, appetite loss, vomiting, and fever in young children). Other adverse reactions to these vaccines may occur. Vaccination with Flublok Quadrivalent may not protect all individuals.

11/05/2019 - 14:54