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Message definition (Hydroxocobalamin ) ===Injectable hydroxocobalamin=== Injection of hydroxocobalamin is used to rectify the following causes of vitamin B<sub>12</sub> deficiency (list taken from the drug prescription label published by the [[Food and Drug Administration (United States)|U.S. Food and Drug Administration]]) * Dietary deficiency of vitamin B<sub>12</sub> occurring in strict vegetarians and in their [[breastfed]] infants (isolated vitamin B<sub>12</sub> deficiency is very rare) * Malabsorption of vitamin B<sub>12</sub> resulting from damage to the stomach, where [[intrinsic factor]] is secreted, or damage to the [[ileum]], where intrinsic factor facilitates vitamin B<sub>12</sub> absorption. These conditions include [[tropical sprue]] and [[nontropical sprue]] (celiac disease). * Inadequate secretion of intrinsic factor, resulting from lesions that destroy the [[gastric mucosa]] (which can be caused by ingestion of corrosives, extensive [[tumors]], and conditions associated with gastric atrophy, such as [[multiple sclerosis]], certain [[endocrine disorders]], [[Iron deficiency (medicine)|iron deficiency]], and subtotal [[gastrectomy]]) * Structural lesions leading to vitamin B<sub>12</sub> deficiency, including regional [[ileitis]], ileal reactions, and malignancies * Competition for vitamin B<sub>12</sub> by [[intestinal parasites]] or bacteria. The [[tapeworm]] from undercooked fish (''[[Diphyllobothrium latum]]'') absorbs huge quantities of vitamin B<sub>12</sub>, and infested patients often have associated gastric atrophy. The [[blind loop syndrome]] may produce deficiency of vitamin B<sub>12</sub> or [[folate]]. * Inadequate use of vitamin B<sub>12</sub>, which may occur if [[antimetabolites]] for the vitamin are employed in the treatment of [[neoplasia]] [[Pernicious anemia]] is the most common cause of vitamin B<sub>12</sub> deficiency. While it technically refers to anemia caused specifically by autoimmune deficiency of intrinsic factor, it is commonly used to refer to B<sub>12</sub>-deficient anemia as a whole, regardless of cause.
ヒドロキソコバラミン注射剤
ヒドロキソコバラミン注射剤は、ビタミンB12 欠乏の以下の原因を改善するために使用される(リストはU.S.Food and Drug Administration 発行の薬物処方ラベルから引用)。