Cromolyn Sodium
Cromolyn Sodium is a mast cell stabilizer used to prevent allergic reactions. It is commonly prescribed for asthma prophylaxis, allergic rhinitis, and certain eye conditions. The medication must be used regularly to be effective and is not intended for acute symptom relief.
Cromolyn Sodium is a preventive allergy medication that works by stabilizing mast cells to reduce the release of inflammatory substances.
Key facts at a glance
- RxNorm
- 3538
- Generic
- Cromolyn Sodium
- Class
- pin-variant
- Brands
- Nasalcrom, Gastrocrom
- 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.
Used for prevention of asthma symptoms, allergic rhinitis (hay fever), vernal keratoconjunctivitis, and as an adjunct in treating systemic mastocytosis. Also available as eye drops for allergic eye conditions.
Acts as a mast cell stabilizer by inhibiting the release of histamine, leukotrienes, and other inflammatory mediators that cause allergic symptoms. Prevents the degranulation of sensitized mast cells upon exposure to antigens.
Must be taken regularly for maximum benefit, as it does not relieve acute symptoms. Onset of action is gradual (1-2 weeks for full effect). Generally well-tolerated with minimal systemic absorption. May cause throat irritation, cough, or nasal stinging. Inhaled form requires proper device technique.
Official drug label
WellAlly may earn a referral fee from linked resources at no extra cost to you. Editorial content is never influenced by commercial relationships.
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