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Introduction The long-acting muscarinic antagonist tiotropium bromide is approved in many countries as maintenance therapy for chronic obstructive pulmonary disease (COPD). Tiotropium is available as a dry-powder formulation delivered via HandiHaler® (18 μg once daily) and is now also approved as an aqueous solution delivered via the Respimat® Soft Mist™ Inhaler (5 μg once daily, 2 puffs of 2.5 µg)...
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