維生素B_(12)系从肝脏中提出的一种暗紅色結晶或粉末,因其化学結構中含有金属鈷,故商品称为Cyanocobalamine。本品能治疗巨初赤血球貧血症(megaloblastic anaemia),其作用与肝注射液相同,但本品的优点为:不含杂質,用量小,注射次数少,注射后無疼痛感,不生激惹或过敏性反应。在应用时,由于本品价格極昂,且系进口,故仍不应濫用。关于維生素B_(12)临床上採用的剂型,近年来某些資本主义国家會將本品加入維生素B羣中制成溶液剂或片剂供口服用。但口服是否有疗效尚屬可疑,一般 Vitamin B_ (12) is a dark red crystal or powder proposed by the liver. Because of its chemical structure containing metallic cobalt, the product is called Cyanocobalamine. This product can treat megaloblastic anaemia, its role and liver injection the same, but the advantages of this product are: free of impurities, the amount of small, less injection, no pain after injection, not raw Provoke or allergic reaction. In the application, due to the high price of the product, and the Department of imports, it should not abuse. About vitamin B_ (12) clinically used formulations, in recent years some capitalist countries will be added to the vitamin B group to make a solution or tablet for oral use. However, whether oral efficacy is suspicious, in general