THE PRESENT INVENTION IS DIRECTED TO PROVIDING PRASUGREL HYDROCHLORIDE OR THE LIKE WITH A REDUCED CONTENT OF OXTP. A METHOD FOR PRODUCING PRASUGREL HYDROCHLORIDE WITH A REDUCED CONTENT OF OXTP, COMPRISING DISSOLVING FREE PRASUGREL CONTAINING OXTP IN AN INERT SOLVENT AND ADDING HYDROCHLORIC ACID OPTIONALLY DROPWISE TO THE SOLUTION FOR REACTION IS ALSO PROVIDED.