An inhalation kit comprising: (a) an inhaler displaying a flow resistance of about 0.01 to 0.1, √{square root over (kPa)} min/L and (b) an inhalable powder comprising tiotropium in admixture with a physiologically acceptable excipient with an average particle size of between 10 to 500 μm, and a method of administering an inhalable powder containing tiotropium in admixture with a physiologically acceptable excipient with an average particle size of between 10 μm to 500 μm, the method comprising actuating an inhaler a flow resistance of about 0.01 to 0.1 √{square root over (kPa)} min/L containing the inhalable powder.
