Prevention

If you have a serious allergy or have experienced anaphylaxis in the past, it's important to try to prevent future episodes.

Identify triggers

Finding out if you're allergic to anything that could trigger anaphylaxis can help you avoid these triggers in the future.

If you've had anaphylaxis and have not already been diagnosed with an allergy, you should be referred to an allergy clinic for tests to identify any triggers.

The most commonly used tests are:

a skin prick test – your skin is pricked with a tiny amount of a suspected allergen to see if it reacts
a blood test – a sample of your blood is taken to test its reaction to a suspected allergen

Read more about diagnosing allergies and allergy testing.

Avoid triggers

If a trigger has been identified, you'll need to take steps to avoid it in the future whenever possible. Read our advice about avoiding some specific triggers.

Food

You can reduce the chances of being exposed to a food allergen by:

checking food labels and ingredients
letting staff at a restaurant know what you're allergic to so it's not included in your meal
remembering some types of food may contain small traces of potential allergens – for example, some sauces contain wheat and peanuts

Read about living with a food allergy

Insect stings

You can reduce your risk of being stung by an insect by taking basic precautions, such as:

moving away from wasps, hornets or bees slowly without panicking – do not wave your arms around or swat at them
using an insect repellent if you spend time outdoors, particularly in the summer
being careful drinking out of cans when there are insects around – insects may fly or crawl inside the can and sting you in the mouth when you take a drink
not walking around outside with bare feet

Some specialist allergy centres can also offer special treatment to help desensitise you to insect stings (immunotherapy).

Medicines

If you're allergic to certain types of medicines, there are normally alternatives that can be safely used.

For example, if you're allergic to:

penicillin – you can normally safely take a different group of antibiotics known as macrolides
non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen and aspirin – you can normally safely take paracetamol; read the ingredients of things like colds medicines carefully to make sure they do not contain NSAIDs
one type of general anaesthetic – others are available, or it may be possible to perform surgery using a local anaesthetic or an epidural injection

Always tell any healthcare professional about medicine allergies you have, as they may not be aware of them.

Carry adrenaline auto-injectors

You may be prescribed an adrenaline auto-injector if there's an ongoing risk you could develop anaphylaxis.

There are 3 types of auto-injector – EpiPen, Jext and Emerade – that are each slightly different.

It's important to remember the following:

carry 2 auto-injectors at all times – there should be no exceptions; you may also be advised to get an emergency card or bracelet with full details of your allergy and doctor's contact details to alert others
extremes of heat can make adrenaline less effective – so do not leave your auto-injector in the fridge or your car's glove compartment, for example
check the expiry date regularly – an out-of-date injector will offer limited protection
manufacturers offer a reminder service, where you can be contacted near the expiry date – check the information leaflet that comes with your medicine for more information
do not delay injecting yourself if you think you may be experiencing anaphylaxis, even if your initial symptoms are mild – it's better to use adrenaline early and then find out it was a false alarm than delay treatment until you're sure you're experiencing severe anaphylaxis

If your child has an auto-injector, they will need to change over to an adult dose once they reach 30kg (approximately 4.5 stone).

Page last reviewed: Tue Nov 2022 Next review due: Fri Feb 2020