The invention provides inhalation devices comprising a compound which is 4-{(1R)-2-[(6-{2-[(2,6-dichlorobenzyl)oxy]ethoxy}hexyl)amino]-1-hydroxyet- hyl}-2-(hydroxymethyl)phenol; or a salt or solvate thereof, inhalation devices comprising formulations and combinations of the compound or a salt or solvate thereof, and methods for the treatment or prophylaxis of a clinical condition in a mammal by employing the inhalation devices