Abstract: Disclosed is a lyophilized rapidly disintegrating solid dosage form, one embodiment of which comprises a thrombin receptor antagonist such as, or a pharmaceutically acceptable salt or hydrate thereof, a polymer such as gelatin, and a matrix forming agent such as mannitol. Systems for effectively buffering the pre-lyophilized suspension are taught, along with methods of treating patients at risk for acute coronary syndrome by administering such a rapidly disintegrating solid dosage form.