Medically reviewed by Drugs.com. Last updated on Dec 1, 2021.
Commonly used brand name(s)
In the U.S.
- Flublok 2015-2016 Formula
- Flublok 2016-2017 Formula
- Flublok 2017-2018 Formula
- Flublok Quadrivalent 2016-2017 Formula
- Flublok Quadrivalent 2017-2018 Formula
Available Dosage Forms:
Therapeutic Class: Vaccine
Uses for Flublok
Influenza virus vaccine, recombinant is used to prevent infection caused by the influenza viruses in adults 18 years of age and older. The vaccine works by causing your body to produce its own protection (antibodies) against the disease. It is also known as a “flu shot”.
It is necessary to receive an influenza vaccine injection each year, since influenza infections are usually caused by different kinds of viruses and the protection gained by the vaccine lasts less than a year. The best way to help prevent influenza infections is to get an influenza vaccination each year, usually in early November.
This vaccine is to be given only by or under the supervision of your doctor or other health care professional.
Before using Flublok
In deciding to use a vaccine, the risks of taking the vaccine must be weighed against the good it will do. This is a decision you and your doctor will make. For this vaccine, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of Flublok® or Flublok® Quadrivalent in children 3 to 17 years of age. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of Flublok® or Flublok® Quadrivalent in the elderly.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving this vaccine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Receiving this vaccine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Receiving this vaccine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with food/tobacco/alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other medical problems
The presence of other medical problems may affect the use of this vaccine. Make sure you tell your doctor if you have any other medical problems, especially:
- Guillain-Barré syndrome (GBS, a severe nerve and muscle problem), history of—Use with caution. May cause the symptoms of this condition to return.
- Immune system problems from a disease or medicine—May not work as well in patients with this condition.
Proper use of Flublok
This section provides information on the proper use of a number of products that contain influenza virus vaccine recombinant. It may not be specific to Flublok. Please read with care.
A nurse or other trained health professional will give you this vaccine. This vaccine is given as a shot into one of your muscles, usually in the shoulder area.
You need to get the flu vaccine every year to protect you from the flu.
This medicine comes with a patient information sheet. It is very important that you read and understand this information. Ask your doctor if you have any questions.
Precautions while using Flublok
Be sure to notify your doctor of any side effects that occur after you receive this vaccine.
This vaccine may cause a serious type of allergic reaction called anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Tell your doctor right away if you have a rash, itching, swelling of the tongue and throat, or troubled breathing after you get the injection.
Influenza virus vaccine may not protect everyone who receives the vaccine. Also, this vaccine will not treat flu symptoms if you already have the virus.
Make sure your doctor knows 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. Your doctor may still want you to get the vaccine because it can give you some protection.
Flublok side effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor or nurse immediately if any of the following side effects occur:
Incidence not known
- difficulty with swallowing
- fast heartbeat
- hives, itching, or skin rash
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- tightness in the chest
- unusual tiredness or weakness
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Difficulty with moving
- joint pain
- muscle aching or cramping
- muscle pains or stiffness
- pain at the injection site
- swollen joints
- redness, bruising, or swelling at the injection site
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Frequently asked questions
More about Flublok (influenza virus vaccine, inactivated)
- Side effects
- Drug interactions
- Dosage information
- During pregnancy
- Reviews (2)
- Drug class: viral vaccines
- FDA approval history
Related treatment guides
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.