Acid addition salts of 2-acetoxy-5-( alpha -cyclopropyl-carbonyl-2-fluorobenzyl)-4,5,6,7-tetrahydrothienoÄ3,2-cÜ- pyridine. ÄEffectsÜ The acid addition salts of tetrahydrothienopyridine derivatives of the present invention exhibit excellent oral absorption, metabolisation into the active compound, and platelet aggregation-inhibiting effects, low toxicity, and excellent storage and handling stabilities, and are useful as medicaments, preferably preventive or therapeutic agents (particularly therapeutic agents) for diseases caused by thrombus or embolus, still more preferably preventive or therapeutic agents (particularly therapuetic agents) for thrombosis or embolism.
