The present invention relates to a propellant-free aerosol formulation which [contains] one or more compounds of general formula (1) wherein the groups R1, R2, R3 and X− may have the meanings given in the claims and in the description, for inhalation.本発明は、式1の化合物を1以上含む、噴射剤を含まない吸入のためのエアロゾル製剤に関し、(1)式中、基R1、R2、R3及びX-は請求項及び明細書に記載された意味を有してもよい。