Abstract: This invention provides a solid pharmaceutical composition comprising an active ingredient (e.g., rasagiline) or a pharmaceutically acceptable salt thereof, and particles having a non-filamentous microstructure of at least two sugar alcohols. This invention also provides a solid pharmaceutical composition comprising an active ingredient (e.g., rasagiline) or a pharmaceutically acceptable salt thereof, a mixture of a disintegrant, a flow agent and particles having a non-filamentous microstructure of at least two sugar alcohols, a supplemental sugar alcohol, a supplemental flow agent, and a supplemental disintegrant. Finally, this invention provides a process of making such solid pharmaceutical compositions.