If you have a severe allergic reaction, your symptoms may include: This type of severe reaction is called anaphylaxis. Anaphylaxis is commonly triggered by an allergy to wasp and bee stings, latex, and certain foods, including eggs, fish, shellfish, cow’s milk and nuts. If you have anaphylaxis, it’s important that you get medical help immediately, as it can be very serious and you need an adrenaline injection.
If you have an adrenaline device – such as an Epipen® – you or a trained individual need to inject it and seek immediate medical help.
For information about taking antihistamines, see our FAQ: Best method.
As well as taking antihistamines to treat the symptoms, it’s important to manage whatever is causing your symptoms.
Ask your GP for advice if you feel you need to be treated with antihistamines while pregnant or breastfeeding.There are currently two main types of antihistamine: sedating and non-sedating.These are the older or ‘first generation’ antihistamines.These may then trigger irritation in your: Antihistamines work by blocking the effect of histamine in your body.This helps to prevent inflammation and eases allergic reactions.