Abstract: Methods of preparing elastomeric gasket materials for use in metered dose inhalers that include contacting an elastomeric gasket material to be used in a metered dose inhaler, which gasket material comprises one or more extractable compounds, with a solution comprising an organic solvent under conditions sufficient to extract at least a portion of at least one of the one or more extractable compounds from the elastomeric gasket material are described. Sealing gaskets made by such methods as well as metering valves, metered dose inhalers, and drug products that include such gaskets are also described.

Abstract: The invention relates to a method of improving the chemical stability of an active ingredient substance in a particulate formulation in chemically reactive environment comprising associating the active ingredient substance with a chemically stabilising amount of cholesterol to form composite particles comprising said active ingredient substance and cholesterol.