Cromolyn
Nasalcrom is a nasal spray medication containing cromolyn sodium, used to prevent and treat symptoms of allergic rhinitis such as nasal congestion, sneezing, itching, and runny nose. It is commonly used for seasonal allergies (hay fever) and perennial allergies triggered by pet dander, dust mites, or mold.
Nasalcrom is a nasal spray that prevents allergic rhinitis symptoms by stabilizing mast cells in the nasal passages.
Key facts at a glance
- RxNorm
- 203441
- Generic
- Nasalcrom
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- 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.
Nasalcrom is used to prevent and relieve symptoms of allergic rhinitis, including nasal congestion, sneezing, itching, and runny nose caused by seasonal allergens (such as pollen) or year-round allergens (such as pet dander, dust mites, or mold).
Nasalcrom contains cromolyn sodium, which works as a mast cell stabilizer. It prevents mast cells from releasing histamine and other inflammatory mediators that cause allergic symptoms when triggered by allergens.
Nasalcrom is most effective when used before allergen exposure and must be used regularly for best results. It has minimal systemic absorption and is generally well-tolerated with few side effects, which may include mild nasal irritation or sneezing. It is available over-the-counter. Consult a healthcare provider if symptoms persist or worsen after regular use.
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 July 26, 2026. · Read our editorial policy