Cromolyn sodium (also called sodium cromoglycate) is a mast cell stabilizing drug. It is available as a nasal spray (Nasalcrom®) to treat allergic rhinitis, as an inhaler (Intal®) to treat asthma, as eye drops (Opticrom®) for allergic conjunctivitis, or in an oral form (Gastrocrom®) to treat mastocytosis).