The flu vaccine can cause a range of common side effects including:
- Drowsiness or tiredness
- Muscle aches
- Localised pain, redness and swelling at the injection site
- Occasionally, an injection-site lump (nodule) that may last many weeks but needs no treatment
- Low-grade temperature (fever).
Common side effects following immunisation are usually mild and temporary (occurring only in the first few days after vaccination) and treatment is not usually required.
There is a very small risk of a serious allergic reaction (anaphylaxis) to any vaccine. This is why you are advised to remain in the pharmacy for at least 15 minutes following vaccination in case further treatment is required. Apart from anaphylaxis, other extremely rare side effects include febrile convulsions in children.
If the side effect following immunisation is unexpected, persistent or severe, or if you are worried about yourself or your child’s condition after a vaccination, contact your GP immediately, or attend your nearest hospital emergency room or, if required, call 000.