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Grazax is a type of medicine that makes the body less sensitive to certain allergens. Grazax tablets contain an extract of grass pollen allergen (Timothy grass). More information

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£153.41 (incl. VAT)
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Prescription required
Yes (consultation included in the price)

Read the package leaflet for more information about risks and side effects, or ask your doctor or pharmacist for advice.

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Patient Leaflet(s)

What is Grazax?

Grazax is a type of medicine that makes the body less sensitive to certain allergens. Grazax tablets contain an extract of grass pollen allergen (Timothy grass). The grass pollen extract is thought to stimulate the body’s immune system to produce antibodies against grass pollen. This approach is called immunotherapy. Grazax is a prescription-only medicine.

What is Grazax used for?

Immunotherapy used to treat hay fever caused specifically by an allergy to grass pollen. Hay fever symptoms include:

  • Repeated sneezing, a runny or blocked nose (rhinitis);
  • Infected, itchy, burning, watery and/or red eyes;
  • Skin rash/itching;
  • Shortness of breath and/or asthma attacks.

How to use Grazax

For the greatest effect, Grazax tablets should ideally be started four months before the grass pollen season starts. Remove the tablet from the blister pack and place it under the tongue. Leave it there for a few seconds until it dissolves. Try not to swallow for a minute. You should not eat or drink for at least five minutes after taking the tablet. It is recommended that you continue the treatment for three to five years. During this time your allergy symptoms will gradually start to improve. If your symptoms have not improved after two pollen seasons, you should consult a doctor.


Unless otherwise advised by the doctor, the recommended dose for adults and children aged five and above is:

  • one tablet once a day, dissolved under the tongue.

Do not exceed the recommended dose and read the package leaflet closely before use.

Side effects

Grazax tablets may cause side effects, including:

  • Common cold;
  • Allergy-like symptoms: itching in the mouth, throat, eyes or ears, a runny or blocked nose, sneezing, coughing, (itchy) skin rash, swollen tongue or lips;
  • Headache;
  • Gastrointestinal symptoms;
  • Fever.

Most side effects are temporary. If you experience any swelling of the face, mouth or throat, difficulty breathing or worsening of asthma after taking this medicine, you should consult a doctor immediately. For a complete list of possible side effects, see the package leaflet.

When not to use Grazax

Grazax is not suitable for everyone and should not be used if:

  • You are allergic to any of the ingredients in this medicine;
  • You have a disease affecting the immune system;
  • You have cancer or severe asthma;
  • You have a severe inflammation of the mouth;
  • You have recently had surgery on the mouth, a tooth removed, or a tooth fall out. In this case, this medicine should be stopped for seven days until the wound has completely healed.

Consult a doctor on the use of Grazax if you have a severe allergy to fish or if you’ve ever experienced an allergic reaction to grass pollen injections. Grazax may interact with other medicines. Therefore, it is important to tell the doctor what other medicines you are currently taking.

Pregnancy/driving ability/alcohol

Treatment with Grazax should not be started in pregnant women, as the effects of Grazax during pregnancy are not yet known. If you get pregnant while taking Grazax you should tell your doctor. Your doctor will let you know if you can continue this treatment. Seek medical advice from your doctor before using this medicine if you are breastfeeding.

Grazax does not interact with alcohol or affect your ability to drive safely.

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