What should you know about intranasal influenza vaccine?

The spray is given into the nose rather than by injection. It contains a vaccine formulation selected for influenza prevention; it does not treat influenza after you become ill. Protection develops after vaccination and can vary with age, health, circulating viruses, and the formulation used. A blocked nose may affect how the spray is given, so tell the vaccinator about current nasal symptoms.

The vaccine is not suitable for everyone. A clinician should check age, pregnancy, immune-system problems, severe allergies, breathing conditions, and medicines before vaccination. An inactivated vaccine may be an alternative in some situations; see Inactivated Vaccine for a different vaccine type.

Share your medical history, allergies, pregnancy status, and previous vaccine reactions before the spray is given. Mention recent fever or significant illness and any treatment that affects immunity. Follow the service's instructions after vaccination and keep a record of the product and date. Mild nasal irritation, a runny nose, headache, or tiredness can occur; ask the vaccinator what to expect and how to manage discomfort.

Seek urgent medical help for trouble breathing, swelling of the lips or face, widespread hives, faintness, or rapidly worsening symptoms after vaccination. These can signal a serious allergic reaction. For less urgent concerns, contact the vaccination service if symptoms are persistent, severe, or unusual for you.

Ask whether the nasal spray is appropriate for your age and health, whether a nasal blockage changes the plan, and whether an injected or inactivated vaccine is a more suitable option. You can also ask when protection is expected and which reactions should prompt a call.