PROBLEM TO BE SOLVED: To provide preparation particles constituting an ambroxol-blended sustained-release preparation taken as a granule agent or a dispersing agent as it is, formed as a capsule preparation by being encapsulated into a gelatin hard capsule, having a suitable size preventing enlargement of the preparations when being mixed with another excipient and subjected to compression molding to form a tablet, not requiring considerable time in the production thereof, delaying elution of ambroxol or a salt thereof when film coating is applied thereto, and retaining a medicinal effect of ambroxol over long hours from just after administration by being combined with immediate release ambroxol-containing particles, for example, preparation particles to which film coating is not applied.SOLUTION: The preparation particle does not include nuclear particles made of only an excipient, includes ambroxol or a salt thereof and the excipient, and has a mean particle diameter of 400-1,000 μm, and a geometric standard deviation of particle size distribution of ≤1.5.
