What is Flublok Quadrivalent: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Flublok Quadrivalent overview

BRAND NAMES:

  • Fluzone High-Dose 2019-2020 Formula, Fluzone High-Dose Quadrivalent 2020-2021 Formula, FluLaval Quadrivalent 2020-2021 Formula, FluLaval Quadrivalent 2019-2020 Formula, FluLaval Quadrivalent 2017-2018 Formula, Flucelvax Quadrivalent 2020-2021 Formula, Flucelvax Quadrivalent 2019-2020 Formula, Flublok Quadrivalent 2020-2021 Formula, Flublok Quadrivalent 2019-2020 Formula, Fluarix Quadrivalent 2020-2021 Formula, Fluarix Quadrivalent 2019-2020 Formula, Fluad 2019-2020 Formula, Afluria Quadrivalent 2020-2021 Formula Pediatric, Afluria Quadrivalent 2019-2020 Formula, Afluria Quadrivalent 2020-2021 Formula

Generic Names:

  • Flublok Quadrivalent

Uses:

  • Helps prevent infection with influenza (flu) virus.

Therapeutic Classes:

  • Vaccine

Forms:

  • Injectable

How it’s taken:

  • By injection

What is Flublok Quadrivalent used for?

What form(s) does Flublok Quadrivalent come in

  • Injectable

What are common Flublok Quadrivalent doses?

  • Syringe 0.5ML of 0.5ML

Common Flublok Quadrivalent prescriptions

  • Flublok Quadrivalent
    0.5ml of 0.5ml syringe

How to take Flublok Quadrivalent

  • The vaccine is given as a shot into a muscle or into your skin, usually in the shoulder area. The shot could be given in the thigh for babies and young children.

  • Injection routeA nurse or other health provider will give you this medicine.

  • Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.

  • A child who is younger than 9 years old and who has not had a flu shot before may need 2 shots. The second shot should be given about 1 month after the first.

  • Missed dose: Most people need only 1 dose of the vaccine. If your child needs a second dose, it is important for the vaccine to be given on schedule. If you must cancel an appointment, make a new one right away.

  • Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.

  • Injection routeA nurse or other health provider will give you this medicine.

  • Missed dose: Most people need only 1 dose of the vaccine. If your child needs a second dose, it is important for the vaccine to be given on schedule. If you must cancel an appointment, make a new one right away.

  • The vaccine is given as a shot into a muscle or into your skin, usually in the shoulder area. The shot could be given in the thigh for babies and young children.

  • A child who is younger than 9 years old and who has not had a flu shot before may need 2 shots. The second shot should be given about 1 month after the first.

What to do if you miss a dose of Flublok Quadrivalent

Flublok Quadrivalent contraindications

  • This vaccine is not right for everyone. You should not receive it if you had an allergic reaction to flu vaccine. If you are allergic to eggs, tell the caregiver who is going to give you the injection. Some brands of this vaccine contain egg proteins and could cause an allergic reaction.

Flublok Quadrivalent warnings

  • Tell your doctor if you are pregnant or breastfeeding or if you have a weak immune system.

  • Tell your doctor if you ever had an unusual reaction to a flu shot, such as Guillain-Barré syndrome, or if you are allergic to latex.

  • The flu vaccine may not protect everyone who receives it. This vaccine will not treat flu symptoms if you have already been infected with the virus.

  • Seizure

  • Severe muscle weakness

Flublok Quadrivalent interactions

  • Tell your doctor if you are using a medicine or treatment that weakens your immune system, such as a steroid, radiation, or cancer treatment. This vaccine may not work as well if you are also using these medicines. However, your doctor may still want you to get the vaccine because it can give you some protection.

  • Tell your doctor if you ever had an unusual reaction to a flu shot, such as Guillain-Barré syndrome, or if you are allergic to latex.

  • The flu vaccine may not protect everyone who receives it. This vaccine will not treat flu symptoms if you have already been infected with the virus.

Flublok Quadrivalent side effects

Serious Side Effects

  • Severe muscle weakness

  • Seizures

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Fainting, dizziness, or lightheadedness

  • Fever over 103 degrees F

Less Serious Side Effects

  • Redness, pain, swelling, soreness, or a lump where the shot was given

  • Headache, muscle pain, tiredness

  • Irritability or crying (in a child)