The present invention relates to a preparation for inhalation use in form of dry powder comprising particles of ambroxol and/or hydrochlorides thereof, and at least a pharmaceutically acceptable excipient and/or dispersant wherein at least 85% of said particles has a geometrical diameter from 3 to 5 μm. The present invention further relates to the methods for preparing such composition and uses thereof. The present invention thanks to the very fine particles of dry powder, as above defined, constitutes a composition for inhalation use with optimum performances which, combined with inhaler action, reaches and acts directly on the bronchi or on the damaged respiratory tract. The local action and the quick absorption of the drug guarantee good features of bioavailability. The decrease in dosing Ambroxol with respect to the other existing oral or injectable formulations allows to reach quickly, locally and safely, the therapeutic target.
