Yes, it is safe to take Montair FX (montelukast and fexofenadine), Doxy100 (doxycycline), and Brozedex Syrup (terbutaline, ambroxol, and guaifenesin) if you have a sulfa allergy. None of these medications contain sulfonamides (the compounds responsible for sulfa allergies), nor do they cross-react with them. Please be reassured that a sulfa allergy is also entirely different from an allergy to sulfur or sulfites. You can safely take these medicines as prescribed by your doctor. Always monitor how you feel, and reach out if you have any further concerns.
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Are Montair FX, Doxy100, and Brozedex Syrup safe to take for someone with a sulfa (sulfur) allergy?