Influenza Virus Vaccine Recombinant (Intramuscular)


The Influenza Virus Vaccine Recombinant, also known as the 'œflu shot'is given to patients aged 18 and older as a way to prevent them contracting the Influenza Virus and other infections this then leads to. As a live vaccine, it works by causing your body to make its own form of defense (antibodies) against the disease.

Influenza infections are often caused by different sorts of viruses, so it is necessary to get a vaccine injection every year. This ensures you are better protected each and every flu season. It is usually best to get this injection around November time.

You will receive the vaccine from a doctor or other trained healthcare professional.

Condition(s) treated

  • Influenza Virus

Type of medicine

  • Solution for injection

Side Effects

As well as having its intended effect, it is possible that Influenza Virus Vaccine Recombinant will cause some patients to experience side effects. Below is a list of the more serious side effects. If you experience any of these after receiving this injection, contact your doctor immediately.

Incidence not known

  • Fast heartbeat

As well as these more serious side effects, you could experience some of the less serious ones listed below. These don't necessarily require medical attention, and you may well find they pass over time as your body adjusts to the medicine. However, if you do experience any of the following and find them lingering or bothersome, you can still contact your doctor for any guidance.

More common

  • Muscle stiffness or pains

Less common

  • Swelling, redness, or bruising at the injection site

You may experience side effects not listed here. If they are worrying you, then you can still contact your doctor for advice.


You will not need to worry about the doses of this medicine. It is given by a trained medical professional who knows the right dosage. It is given by an injection into one of your muscles, most often in your shoulder area.

Be aware, you should get this vaccine every year to prevent the flu.

Before receiving the vaccine, you will get a patient information sheet. You should read it carefully and address any questions you have to the administering nurse or doctor prior to injection.


It is possible that the Influenza Virus Vaccine Recombinant will interact with other drugs you are currently taking. You will, therefore, need to inform your doctor of all prescription and nonprescription drugs you currently use. This way your doctor can decide the likeliness of any interactions occurring and make necessary adjustments to the drugs you take. They may need to change certain medicines altogether or possibly adjust the doses you receive at the time as getting the Influenza Virus Vaccine Recombinant. Either way, your doctor is best placed to decide upon any necessary changes. Below is a list of drugs which are known to interact moderately with Influenza Virus Vaccine Recombinant.

  • Mycophenolic acid

The drugs listed below are known to cause minor interactions when used at the same time as Influenza Virus Vaccine Recombinant. Again, inform your doctor if you take any of the following as they may wish to alter your prescriptions.

  • Oxtriphylline

As well as interacting with drugs, this vaccine could interact with certain parts of your dietary intake. In order to avoid unwanted interactions, your doctor may advise you to avoid or to consume less of certain things. This could be things you eat, smoke, or drink. For example, it may be necessary to drink less alcohol or smoke less tobacco.

It is also possible that this vaccine will interact with other medical problems you currently have. You should inform your doctor of any conditions you have now or have had in the past. In particular the following:

  • Immune system problems from a medicine or disease. This vaccine may not work as well if you have this condition


Before giving you this vaccine, your doctor will need to ensure that it is indeed safe and suitable for you to receive. As a part of this process, you will need to inform them of any allergies you have. This includes allergies to animals, dyes, preservatives, and foods.

As of writing, no safety and efficacy have been established for the use of this vaccine in children aged between 3 and 17. This refers to the drugs branded Flublok® or Flublok® Quadrivalent. This is because no suitable studies have taken place on the effects of age on this medicine.

No studies that have taken place have indicated that this vaccine is any less useful in geriatric patients. Again, this refers to drugs branded Flublok® and Flublok® Quadrivalent.

It appears that studies have taken place on pregnant women or animals receiving this vaccine, but it is unclear as to which. If there are any increased risks of you receiving this vaccine whilst pregnant, your doctor can discuss this with you. If you are about to receive another yearly injection and are now pregnant, you should inform them of this fact before receiving the vaccine.

As of writing, no suitable studies have taken place on breastfeeding women receiving this vaccine. Your doctor can advise you of any increased risks and can then weigh these with you against the benefits of receiving the vaccine.

If you experience any side effects after having taken this vaccine, you should notify your doctor.

It is possible that this vaccine will cause you to experience a severe allergic reaction known as anaphylaxis. This can be life-threatening and therefore requires emergency medical treatment. If you experience any of the following symptoms after having received this injection, seek medical assistance right away.

  • Troubled breathing

Be aware that this vaccine will not necessarily protect everyone who receives it. Also, it will not treat any flu symptoms you have if you have already contracted the virus.

Before receiving your injection, you should inform your doctor if you are currently taking any treatment or medicines that weaken your immune system. This includes things like cancer, radiation, or steroid treatment. Your doctor will need to decide whether or not to give you this medicine. It may still give you some protection, or it may not work properly.


You will not need to worry about storing this medicine.


The Influenza Virus Vaccine Recombinant is an injection you should receive every year as a means to ensure your body is most protected against the threat of the Influenza Virus. Your doctor will inform you when the best time to receive it is, though it is usually given around October and November time. Upon receiving the injection, you should then follow any further guidance your doctor offers you.

Be aware that it is possible this medicine will cause you to experience side effects. Above, you can find more details regarding these possible effects. If you experience more severe ones, then you should contact a doctor immediately. If you have any other questions regarding the Influenza Virus Vaccine Recombinant, you can address them to your doctor or to your nurse before receiving the injection.