Nasalcrom (Cromolyn sodium) is a mast cell stabilizer medication that prevents the mast cells of the immune system from rupturing when exposed to an allergen.  Stabilizing the mast cells prevents them from releasing histamine that cause allergy symptoms.  Cromolyn sodium products are available as prescription oral or nasal inhalers or eyedrops and also as non-prescription nasal spray.  It is most effective as a preventive medication when used as allergy therapy a few weeks before the allergy season.

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