Medical Definition of cromolyn
: a drug C23H14Na2O11 that inhibits the release of histamine from mast cells and is administered as an inhalant to prevent the onset of bronchial asthma attacks, as a nasal spray to treat allergic rhinitis, as eyedrops to treat allergic conjunctivitis, keratitis, or keratoconjunctivitis, and as an oral solution to treat mastocytosis—called also disodium cromoglycate, sodium cromoglycate
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