The invention relates to an inhalable solid pharmaceutical formulation comprising (a) an anti-cholinergic agent, (b) a carrier and (c) a ternary agent that is a sugar ester, an inhaler comprising such a formulation, a method of reducing or inhibiting chemical interaction between an active ingredient substance and a carrier susceptible to chemical interaction, a method of reducing or inhibiting chemical degradation of an active ingredient substance in a formulation comprising a carrier and an active ingredient substance, a method for the treatment of a reversible airways obstruction by administering to a patient in need thereof the inhalable solid pharmaceutical formulation, and a method of preparing a solid pharmaceutical preparation comprising combining (a) an anti-cholinergic agent, (b) a carrier and (c) a ternary agent that is a sugar ester.
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