A prasugrel or its salt is in a micronized, crystalline form. Independent claims are included for the following: (1) a composition (C1) containing the prasugrel or its salt and a hydrophilic polymer (2) a method for the preparation of the composition involving common milling of the prasugrel or its salt and the hydrophilic polymer (3) a composition obtainable by the method and (4) a pharmaceutical composition containing the prasugrel or its salt or the composition and at least one excipient. ACTIVITY : Anticoagulant Thrombolytic. No biological data given. MECHANISM OF ACTION : None given.