Vaccination Information Leaflet
Influenza vaccines help to prevent influenza (also known as flu), a common infection caused by Influenza virus types A and B.
It takes at least 2 weeks for protection to develop after vaccination.
Flu symptoms include fever, chills, headache, feeling tired, muscle aches, sore throat and cough.
According to the National Adult Immunisation Schedule (NAIS) and National Childhood Immunisation Schedule (NCIS)
Elderly aged 65 years and older
Pregnant women in any trimester
Persons with chronic medical conditions such as diabetes or heart, lung, liver and kidney disease
Persons with lower body resistance to infections due to :
Conditions such as leukaemia, HIV, spleen removal, or organ transplant
Using medications or receiving treatment such as taking long-term steroids, certain cancer drugs or radiation therapy
Residents staying in intermediate or long-term care facilities
Persons aged 18 years or younger and receiving long-term aspirin therapy
Children aged 6 months old to 59 months
Click here to book a flu vaccination appointment.
Inform your healthcare professional if:
You are allergic to this vaccine or any of the other ingredients of this vaccine
You have a history of Guillain-Barré Syndrome (a rare condition where the body’s immune system attacks the nerves)
You have a severe allergy to eggs
The flu vaccine or flu shot is either given by injection into a muscle or just underneath the skin.
One dose is recommended per year as flu viruses are constantly changing, and your body’s immunity to influenza viruses may decrease over time.
Severe allergic reactions (anaphylaxis) are rare and can happen within minutes to a few hours after vaccination.
The symptoms of a severe allergic reaction include one or more of the following:
Difficulty in breathing
Itchy skin rashes over your whole body
If you experience any of these symptoms, you should inform your healthcare professional immediately.
Some people may feel faint after the vaccination
Sit for 15 minutes after receiving the vaccine to avoid fainting
Soreness, redness, or swelling at the injection site, slight headache, body aches or tiredness; fever of more than 38oC is not common
These side effects usually go away on its own within 2 to 3 days
You may take paracetamol to help to relieve the pain or fever
The information provided on this page does not replace information from your healthcare professional. Please consult your healthcare professional for more information.
This article is jointly developed by members of the National Medication Information workgroup. The workgroup consists of cluster partners (National Healthcare Group, National University Health System and SingHealth), community pharmacies (Guardian, Unity and Watsons) and Pharmaceutical Society of Singapore. The content does not reflect drug availability and supply information in pharmacies and healthcare institutions. You are advised to check with the respective institutions for such information.
Last updated in Jul 2022
This article was last reviewed on
Friday, November 25, 2022
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