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Once a multiple-dose vial is punctured, it should be assigned a "beyond-use" date

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Seek urgent same-day assessment or call 999 for emergency care if experiencing: Severe chest pain Severe shortness of breath Fainting or collapse Acute or rapidly worsening neurological deficits (such as new limb weakness, sudden gait disturbance, or bladder/bowel dysfunction) Persistent or worsening anaemia symptoms despite treatmentincluding breathlessness, chest discomfort, palpitations, or extreme fatigueshould trigger medical review

Vitamin B12 is transported in the blood by various carrier proteins

Is It Safe to Get B12 Shots Often