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When Should the Patient Not Take This Medicine: If the patient is allergic to any component of the product.
Cyanocobalamin (B12) should, if possible, not be given to patients with suspected vitamin B12 deficiency without first confirming the diagnosis. Also, it should not be used for Leber's disease or tobacco amblyopia. Ascorbic Acid should be given with care to patients with hyperoxaluria and glucose-6-phosphate dehydrogenase (G6PD) deficiency.
