The present invention provides a method of administering formoterol, for example as a fumarate dihydrate, using a nebulizer device for the treatment of bronchoconstriction, such as that caused by asthma and chronic obstructive pulmonary disease. The method of this invention is particularly useful in pediatric, geriatric, handicapped and acutely ill individuals who have been denied the benefits of this medication due to the standard use of dry powder inhalers. The present invention addresses the difficulty of making available a viable commercial nebulizer solution for these individuals who cannot optimally use powder inhaler devices, which are the only presently available delivery systems for this medication.