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Timothy Grass Allergy

What is an allergen?

An allergen is a substance in the environment that causes an allergic reaction in some people.

What is Timothy grass?

Timothy grass is one of the most common grasses in the U.S. and is similar to other common related grasses including:

Sweet Vernal Grass Allergy

Sweet Vernal

Orchard (Cocksfoot) Grass Allergy


Perennial Rye Grass Allergy

Perennial Rye

Meadow Fescue Grass Allergy

Meadow Fescue

Kentucky Bluegrass (June Grass) Grass Allergy

Kentucky Bluegrass
(June Grass)

Redtop Grass Allergy


How your immune system causes allergy symptoms

Grass Allergy Symptom Stuffy Nose

Stuffy Nose

Grass Allergy Symptom Runny Nose

Runny Nose

Grass Allergy Symptom Sneezing


Grass Allergy Symptom Watery Eyes

Watery Eyes

Grass Allergy Symptom Itchy Nose

Itchy Nose

If you have grass allergies, when you breathe in grass pollen, your immune system reacts as if it were harmful

The antibodies trigger a response that causes symptoms like runny nose, sneezing and itchy eyes

The antibodies trigger a response that causes symptoms like runny nose, sneezing and itchy eyes.

Interested in an immunotherapy option for Timothy grass and related grass pollen allergies?

GRASTEK® (Timothy Grass Pollen Allergen Extract) is a daily dose of immunotherapy

Immunotherapy is designed to repeatedly expose your body to small amounts of an allergen. That’s why it’s important to take GRASTEK every day, as your allergy specialist prescribes, even when you don’t have symptoms.

Taking the first tablet in your allergy specialist’s office

The first dose of GRASTEK must be taken in the allergy specialist’s office. After taking the first dose, you or your child will be observed for at least 30 minutes by a healthcare professional for symptoms of a serious allergic reaction. If the first dose is well tolerated, you can continue to take your GRASTEK once a day at home. Children should always take GRASTEK under the supervision of an adult.