Cyanocobalamin (Vitamin B12) should not be used to treat megaloblastic anemia of pregnancy. Administration of doses greater than 10 mcg of Vitamin B12 daily may produce a haematological response in patients with folate deficiency; indiscriminate use may mask the precise diagnosis. Cyanocobalamin or hydroxocobalamin should, if possible, not be given to patients with suspected vitamin B12 deficiency without first confirming the diagnosis. Regular monitoring of the blood is advisable.
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