Overview
Acarizax treatment for house dust mite allergy
Acarizax® is a medicine used to treat allergic symptoms caused by house dust mites. It’s a tablet that you need to take every day for 3 years.
Acarizax helps your body get used to being exposed to house dust mites so you get fewer allergy symptoms.
If you’re allergic to house dust mites, you might get symptoms all throughout the year. These symptoms include:
- an itchy or runny nose, or sneezing caused by inflammation of the nose (allergic rhinitis)
- red, itchy, irritated eyes caused by inflammation of the eye (allergic conjunctivitis)
- wheezing, coughing or shortness of breath caused by inflammation of the airway (allergic asthma)
You can usually treat these symptoms with other medicines like:
- antihistamine tablets
- combination nasal sprays that contain an antihistamine and a steroid
- eye drops
- inhalers that might contain a steroid, if you have asthma
If these medicines do not work and your allergy is affecting your quality of life, we might recommend Acarizax.
Important
Read the leaflet inside your Acarizax medicine package for more information.
How Acarizax treatment works
Acarizax contains a small, fixed amount of house dust mite extract. This is the substance that causes your allergic reaction (allergen).
Taking small doses of the allergen each day helps your body get used to it. Your immune system will slowly build up a tolerance to house dust mites. This means your body will react less to house dust mites and you will get fewer symptoms.
This type of treatment is called desensitisation or immunotherapy.
You’ll need to continue taking the regular medicines you take for your allergic symptoms while taking Acarizax. If you have asthma, you’ll need to continue taking your regular asthma medicines as prescribed.
Within 3 years, your symptoms should improve. After that, you should be able to reduce the amount of other medicines you take for your allergy.
Who can have Acarizax treatment
Before you start treatment, your healthcare team will do an assessment to check if Acarizax is a safe treatment option for you.
We’ll also ask you to complete a questionnaire about your house dust mite allergy and how it affects your quality of life.
Tell us if:
- you have any other health conditions
- you take any medicines – including medicines you buy from a pharmacy or shop, such as vitamins, herbal remedies or dietary supplements
- you’re pregnant or might be pregnant
- you’re breastfeeding
- you have a severe fish allergy – this is important because Acarizax contains fish gelatine
- you have previously had a severe allergic reaction to other allergen immunotherapy injections
Do not take Acarizax if:
- you have a condition that affects your immune system
- you have cancer
- you have severe mouth sores and inflammation
- you have asthma that’s difficult to control
Read the leaflet inside your medicine package for a full list of health conditions that might affect how your body responds to Acarizax treatment.
Resource number: 5686/VER1
Last reviewed: October 2026
Next review due: October 2029
