Mast cell stabilizers are
medications used to prevent or control certain
allergic disorders. They block a calcium channel essential
for mast cell degranulation, stabilizing the cell and so
prevent the release of histamine and related mediators.
As inhalers thay are used to treat asthma, as nasal sprays to treat Hay fever (allergic rhinitis) and as eye drops for allergic conjunctivitis. Finally in oral form they are used to treat the rare condition of mastocytosis.