Hypersensitivity to bisulfites. Not to be used for acute asthma attacks. Not to be substituted for inhaled or oral corticosteroids. Not to be given to patients w/ eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications &/or neuropathy. Not to be taken by patients w/ galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption. Pregnancy & lactation.