Arroyo Willow Pollen Extract
Arroyo Willow Pollen Extract is an allergen preparation derived from willow tree pollen, used primarily for diagnostic testing and allergen immunotherapy (allergy shots) in patients sensitized to willow pollen. This extract contains the specific proteins and antigens from Salix lasiandra (arroyo willow) that trigger allergic reactions in susceptible individuals. Treatment with this medication aims to desensitize the immune system, reducing allergic symptoms over time.
Arroyo Willow Pollen Extract is used to diagnose and treat allergies to arroyo willow pollen through immunotherapy.
Key facts at a glance
- RxNorm
- 852170
- Generic
- Arroyo Willow Pollen Extract
- Class
- unclassified
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- solution
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
This medication is indicated for the diagnosis of willow pollen allergy through skin prick testing and for therapeutic use in allergen immunotherapy (AIT) to treat allergic rhinitis, conjunctivitis, or mild asthma triggered by arroyo willow pollen exposure.
The exact mechanism is not fully specified; however, pollen extracts work by introducing gradually increasing doses of the allergen to the patient, which stimulates the immune system to produce blocking antibodies (IgG) and reduces IgE-mediated mast cell degranulation, thereby decreasing allergic response over time.
This extract should only be administered by healthcare professionals trained in allergen immunotherapy. Patients should remain under observation for 20-30 minutes after each injection due to risk of anaphylaxis. Treatment is contraindicated during uncontrolled asthma or acute illness. Dosing must be individualized based on patient tolerance and response.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy