A method of treating at least one of COPD and/or asthma in a subject is provided, wherein an inhalable medicament is administered, in particular a new solid-state form of tiotropium bromide. The medicament can be in the form of solid amorphous particles containing an intimate admixture of tiotropium bromide together with a pharmaceutically acceptable co-solid having a glass transition temperature of at least -50° C., such as a sugar and/or sugar alcohol.
