The present invention provides processes for preparing suspension aerosol formulations, wherein the particles for inhalation are formed in situ during the process of manufacturing the formulation. In one aspect of the invention, a process for preparing a suspension aerosol formulation comprises the steps of: (a) dissolving one or more medicaments in one or more solvents to form a solution and (b) mixing one or more propellants with the solution under conditions effective to precipitate, entirely or partially, at least one of the medicaments.
