THE PRESENT INVENTION RELATES TO INHALABLE PARTICLES COMPRISING A STABILIZED AMORPHOUS FORM OF TIOTROPIUM WITH A STABILIZING AGENT. IT ALSO RELATES TO INHALABLE PARTICLES COMPRISING A STABILIZED AMORPHOUS FORM OF TIOTROPIUM WITH A STABILIZING AGENT MIXED WITH ONE OR MORE COARSE EXCIPIENTS HAVING A MEAN PARTICLE SIZE OF 15 TO 250 μM. IT ALSO RELATES TO A PHARMACEUTICAL COMPOSITION COMPRISING THE INHALABLE PARTICLES OF THE INVENTION, TO A PROCESS FOR THEIR PREPARATION, AND TO THEIR USE FOR THE PREPARATION OF A MEDICAMENT FOR THE TREATMENT OF ASTHMA OR CHRONIC OBSTRUCTIVE PULMONARY DISEASE (COPD).