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Starting GRASTEK

Although you may not be thinking about grass allergies or experiencing any grass allergy symptoms, the best time to start talking to your allergy specialist about GRASTEK is at least a few months before grass allergy season starts. Starting treatment early may give your body time to become less sensitive in preparation for the grass pollen season. Grass pollen season varies regionally. Talk to your allergy specialist to find out when you should start GRASTEK in your region.
When to start Grastek

Start GRASTEK at least 12 weeks before grass allergy season starts

Visit doctor to start Grastek
The first tablet of GRASTEK must be taken in the doctor’s office
Grastek for Kids
Remember kids should only take GRASTEK with adult supervison
GRASTEK® Timothy Grass Pollen Allergen Extract Tablet for Sublingual Use

Not actual product


  • Take the tablet from the blister package with dry hands
  • Take the tablet immediately after removing it from the blister package.
  • GRASTEK dissolves quickly when placed under the tongue. After taking it, don’t swallow for at least 1 minute.
  • Do not take GRASTEK with food or beverage.
  • Do not eat or drink for 5 minutes after taking the tablet.
  • Wash hands after taking the tablet.

Your allergy specialist will also prescribe epinephrine

When you’re taking GRASTEK, your allergy specialist will also prescribe auto-injectable epinephrine for you or your child to use at home, should you or your child have a severe allergic reaction. You should discuss the proper use of auto-injectable epinephrine with your allergy specialist.

There are 2 dosing recommendations for GRASTEK:

It’s recommended that you start taking GRASTEK at least 12 weeks before the grass pollen season and continue daily until the end of grass pollen season. For sustained effect, it’s recommended that you take GRASTEK once daily, year-round for 3 consecutive years, starting at least 12 weeks before the first grass pollen season. Your allergy specialist will decide which approach is best for you.

Possible Side Effects

The most commonly reported side effects of GRASTEK were itching of the mouth, lips or tongue, swelling under the tongue, or throat irritation. These side effects, by themselves, were not dangerous or life-threatening.

GRASTEK can cause severe allergic reactions that may be life-threatening. Stop taking GRASTEK and get medical treatment right away if you or your child has any of the following symptoms after taking GRASTEK:

  • Trouble breathing
  • Throat tightness or swelling
  • Trouble swallowing or speaking
  • Dizziness or fainting
  • Rapid or weak heartbeat
  • Severe stomach cramps or pain, vomiting or diarrhea
  • Severe flushing or itching of the skin

It’s important that you talk to your allergy specialist to make sure you understand what is a severe allergic reaction to GRASTEK.

GRASTEK is a prescription medicine used for sublingual (under the tongue) immunotherapy to treat Timothy and related grass pollen allergies that can cause sneezing, runny or itchy nose, stuffy or congested nose, or itchy and watery eyes. GRASTEK may be prescribed for persons 5 through 65 years of age who are allergic to grass pollen.

GRASTEK is taken for about 12 weeks before the grass pollen season and throughout the grass pollen season. GRASTEK may also be taken daily for 3 years to provide a sustained effect for a fourth year in which you do not have to take GRASTEK.

GRASTEK is NOT a medication that gives immediate relief for symptoms of grass allergy.

For more information, download the Medication Guide.