Grastek medication is a leader in the fight against nature’s allergens. This wonder drug desensitizes the immune system to grass pollen, ensuring people who struggle with grass pollen allergies remain safe during the grass pollen season.

Grastek is an allergy immunotherapy that alters the body’s immunological response to allergens. The tablet targets Timothy grass pollen, a common grass pollen allergen.

The drug works by progressively exposing the immune system to grass pollen allergens. This controlled allergen exposure simulates a natural interaction, allowing the body to develop immunity to the grass pollens that cause an allergy. As a result, the immune system’s reaction to grass pollen changes from allergic to tolerant.

How Does Grastek Work?

When you take Grastek, the immune cells, especially T and B lymphocytes, interact with grass pollen allergens in this drug, producing antibodies like immunoglobulin E. Repeated allergen exposure alters the immune response, allowing for immunological tolerance.

Once immunological tolerance occurs, the immune system progressively perceives grass pollen allergens as safe, lowering hypersensitivity and allergy symptoms. This immune response shift can reduce grass pollen reactions in the environment.

Since Grastek’s delayed action method, relief may be limited during the early days. However, regular usage of Grastek unlocks its full advantages, mainly when you use it daily for three consecutive years.

Even though Grastek can effectively manage grass pollen allergies, users must follow the correct dosage and routine to register success. In addition, a healthcare expert should evaluate the patient’s medical history and allergic sensitivity before starting Grastek treatment.

Grastek Precautions and Warnings

  • Severe Allergies: Anyone with severe allergies, especially anaphylaxis, should avoid taking Grastek. Similarly, this drug increases the risk of laryngopharyngeal restriction.
  • Medical Conditions: Certain medical conditions like heart disease, high blood pressure, and breathing problems can aggravate the severity of an allergic reaction. People suffering from these medical conditions should stay away from using Grastek.
  • Report Severe Responses: Patients may have tongue or throat irritation or edema upon starting Grastek. Be careful and report any odd or severe responses to doctors immediately.
  • Avoid Grastek when Undergoing Immunotherapy: Patients taking medicines or undergoing allergy immunotherapy should consult their doctors to assess Grastek’s suitability.

Side Effects of Grastek

While generally well-tolerated, Grastek may cause adverse effects when the immune system responds to allergens. Individuals should know these responses and seek medical treatment if they develop unexpected or severe symptoms.

Common Side Effects

  • Itching: Allergen exposure may cause mouth and throat itching. This side effect is usually minor and temporary. Oral rinses or over-the-counter throat treatments may help.
  • Nasal Congestion: Your immune system may react to grass pollen allergens, causing nasal congestion. Over-the-counter nasal decongestants and saline nasal sprays may treat congestion.
  • Irritated Throat: Allergen exposure causes throat irritation, a typical side effect. Hydration and throat lozenges or soothing drinks might reduce throat irritation. Report severe or persistent symptoms to doctors.

Severe Effects

Infrequent yet severe adverse effects may include systemic allergic responses such as:

  • Breathing problems
  • Edema, or
  • Rapid heartbeat

Grastek Drug Interactions

Before taking Grastek, check the list of medications you’re using. Some drugs may interact with Grastek and aggravate the allergic reaction. Common drugs that cause interaction include:

Medication ClassPotential InteractionManagement 
Immunosuppressants (such as Restasis)Possible impact on immune responseThorough evaluation of risks and benefits
Allergy ImmunotherapiesCoordination with healthcare providerEnsures complementary rather than conflicting effects
Specific Medication AllergiesRisk of allergic reactionsCaution and alternative treatment exploration

Grastek Strengths and Dosages

Grastek is available as a white sublingual tablet. Each tablet contains 2800 Bioequivalent Allergy Units (BAUs) of natural grass pollen extract.

You must take one tablet, place it under your tongue, and let it dissolve. Do not swallow for the next 1 minute to allow the tablet to be absorbed through the skin inside your mouth. Also, after taking the tablet, only eat or drink something for up to 5 minutes.

Before taking the first dose of Grastek, your doctor should conduct a blood or skin test to ascertain if you’re allergic to Timothy grass pollens (tests for pollen-specific IgE antibodies). If the tests come out positive, you’ll need to take the initial dose under clinical settings.

Your physician will observe you for up to 30 minutes. You may continue taking subsequent doses at home if there are no noticeable signs of a severe local reaction.

For effective results, start taking this medicine 12 weeks before the beginning of an allergy season. Continue taking the drug daily throughout this period until the season is over. Researchers also advise patients to continue taking Grastek daily for three years uninterrupted for sustained effectiveness.

Strength/DosageRecommended Use
5 mg (Initial Dose)• For adults and children over 12 years old

• Introduction of controlled amounts of grass pollen

• Administered under the tongue, allowing for dissolution

1 mg (Maintenance Dose)• Continued treatment after the initial dose

• Sustains gradual desensitization process

• Reinforces immune tolerance over the long term

Pediatric Dosing• Customized to address specific needs and health factors

• Ensures suitability for children aged five and above

Cost of Grastek in America

Grastek costs approximately $375 for a 30-day tablet prescription. The price may vary depending on where you purchase your medication.

Insurance may partially cover medicine costs, lessening financial burdens. Pharmaceutical and non-profit groups may also offer financial aid or discounts to eligible patients. Even better, you can opt for cheaper alternatives.

At MyRx Outlet, you can save up to 80% on your allergy medications.

Grastek Alternatives

Although Grastek is a promising grass pollen allergen immunotherapy, patients may choose other options based on their preferences, financial muscle, health, and treatment goals. Some of these alternatives may include:

Other Allergen Immunotherapies

Subcutaneous immunotherapy (allergy injections) may be used in place of Grastek. These gradually desensitize the immune system by injecting allergen extracts under the skin.


Over-the-counter or prescription antihistamines relieve grass pollen allergy symptoms. Anti-histamine drugs (such as Atarax) work by blocking histamines, which cause allergic responses.

Nasal corticosteroids

Nasal corticosteroid sprays reduce grass pollen allergy-related nasal irritation and congestion. They are available over-the-counter or by prescription.

Natural Treatments

Some grass pollen allergy victims use herbal supplements or saline nasal spray to relieve symptoms of grass pollen allergy. These solutions should be discussed with your doctor first.

Open discussion with healthcare experts can help you choose the best alternative to Grastek based on your health profile, preferences, and grass pollen allergy severity. A customized strategy helps people navigate the complex allergy management landscape with educated choices.

FAQs Of Grastek

Can kids use Grastek?

Grastek is approved for children over five years old. Dosing for children depends on age, weight, and health.

When does Grastek produce results?

Grastek’s effectiveness varies from one person to another. Some may see results in the first season, but others may need more prolonged treatment.

Are there Grastek dietary restrictions?

There are no diet limitations with Grastek. Individuals should follow healthcare provider advice for optimum results.

Can other allergy drugs be taken with Grastek?

Grastek can react with other drugs. Informing doctors about all prescriptions, including over-the-counter medications and vitamins, reduces the possibility of interactions.

IMPORTANT NOTE: The information provided here is for educational purposes only and is not intended to serve as medical advice, diagnosis, or treatment recommendations. It should not be taken as an endorsement of any specific medication or treatment. Individual health conditions and responses to treatment can vary greatly; therefore, this information should not be seen as a guarantee of safety, suitability, or effectiveness for any particular individual. Always consult with a healthcare professional for personalized medical advice and before making any decisions regarding your health or treatment plans.

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