The net effect is less watery eyes, runny nose and sneezing. This drug works both to prevent and treat those symptoms. Antihistamines previously available relieve symptoms after allergies trigger them, but they work better if taken before symptoms begin. Cromolyn is a nasal spray. It should be started about one week before the allergy sets in and used daily during the season at a dosage of one spray in each nostril every 4 to 6 hours up to six times per day.
Few people experience side effects, such as nasal stinging or burning.
An even greater benefit to this drug is there are no interactions listed in the product labeling. It can be used safely by the elderly and does not cause drowsiness or produce other effects on the heart and central nervous system. It should not be used to treat asthma, colds or sinus infections. This drug is only effective in preventing and treating allergic reactions. For those whom cromolyn does not affect, a new prescription nasal spray has been approved.