Novel betaine salts of acetylsalicylic acid, namely 4-trimethylammoniobutanoate acetylsalicylic acid addition salt (gamma-butyrobetaine acetylsalicylate),L-carnitine acetylsalicylic acid addition salt and 3-(trimethylammonioamino)propanoate (meldonium) acetylsalicylic acid addition salt. Use of meldonium acetylsalicylate as antiplatelet agent for treating various pathologies induced by platelet aggregation, anti-inflammatory and antihyperlipidemic agent.新穎之乙醯柳酸甜菜鹼鹽,亦即4-三甲銨基丁酸乙醯柳酸加成鹽(γ-丁醯甜菜鹼乙醯柳酸鹽)、L-肉鹼乙醯柳酸加成鹽以及3-(三甲基肼)丙酸鹽(米曲肼)乙醯柳酸加成鹽。米曲肼乙醯柳酸鹽作為用於治療各種由血小板聚集誘發之病變的抗血小板製劑、抗發炎和抗高血脂藥劑之用途。