This medication is used to prevent allergic symptoms in the nose. It reduces stuffy/runny nose, mucus dripping into the back of the throat, itching, and sneezing caused by seasonal allergies (hay fever) and other allergens (such as dust mites, pet dander). This medication is not an antihistamine... Cromolyn is known as a mast cell stabilizer. It works by preventing the release of certain natural substances (histamine, SRS-A) made by the body that cause allergy symptoms. Do not use this medication to treat sinus infection, asthma, or cold symptoms. View More Info

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